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In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

Washington (CNN) A heated argument in the West Wing between chief of staff John Kelly and national security adviser John Bolton over a recent surge in border crossings turned into a shouting match Thursday, two sources familiar with the argument told CNN. 
  
 The exchange lay bare a bitter disagreement that has existed between two of President Donald Trump's top aides for weeks now. 
  
 Trump, who was incensed about the rising levels of migrants and threatened to shut down the southern border on Twitter earlier that morning, took Bolton's side during the argument. Bolton favors a harder line approach to the issue and criticized Department of Homeland Security Secretary Kirstjen Nielsen during the argument, a source said. Nielsen used to serve as Kelly's deputy when he ran DHS. Bolton reportedly said Nielsen needed to start doing her job, which incensed Kelly. 
  
 The President, who sources say was present for the beginning of the shouting match, later denied knowledge of it. 
  
 "I've not heard about it. No," Trump told reporters before boarding Air Force One to fly to Montana on Thursday afternoon. 
  
 White House press secretary Sarah Sanders did not deny the incident, and instead pushed blame onto Democrats in a statement later Thursday, insisting that her colleagues are "not angry at one another." 
  
 "While we are passionate about solving the issue of illegal immigration, we are not angry at one another. However, we are furious at the failure of Congressional Democrats to help us address this growing crisis," she said. 
  
 The statement continued, "They should be ashamed for pushing an open borders agenda and are only doing this for strictly political reasons. Despite us having the worst laws in the world and no help from Democrats, our Administration is doing a great job on the border." 
  
 This isn't the first time Nielsen's handling of border security has been scrutinized by the Trump White House. 
  
 Trump said he didn't think she was doing enough to secure the border and two people told The New York Times , which first reported the argument, that Nielsen drafted a resignation letter over the matter. 
  
 While arguing is frequent in this divided West Wing, a source familiar with the clash equated it with a falling out. 
  
 Bolton continued on with scheduled meetings throughout the afternoon. 
  
 The fight between Kelly and Bolton startled several aides throughout the West Wing on Thursday, a person who heard the shouting said, adding that the raised voices went well beyond the heated discussions of the Trump administration. 
  
 After the blowup, aides whispered privately that one of the men might leave the White House given the deep disagreement over the border. The fact that the President sided with Bolton, which only added to Kelly's fury. 
  
 A White House official said later that tempers had cooled and Kelly was not going to leave. Another declined to comment. 
  
 The caravan issue has been the subject of several White House meetings in recent days, according to an administration official. The conversations have centered around not only how to stop the caravan, but also how to use the issue for the upcoming midterms, the official said. Stephen Miller has been heavily involved. 
  
 According to unpublished Department of Homeland Security statistics reviewed by The Washington Post , the number of migrant families entering the US reached record levels in the three months since Trump ended migrant family separations -- a result of the administration's zero tolerance immigration policy. 
  
 Earlier this week Trump also took note of a migrant caravan formed in the Honduran city of San Pedro Sula on Saturday and crossed into Guatemala on Monday. The caravan numbers in the thousands, organizers say. 
  
 Members of the group told CNN en Español that they decided to join the caravan and head to the United States because of insecurity and a lack of jobs in Honduras. Many are traveling with children in tow. 
  
 Trump posted several tweets about the caravan on Tuesday, calling for an end to foreign aid should they continue to travel. 
  
 "We have today informed the countries of Honduras, Guatemala and El Salvador that if they allow their citizens, or others, to journey through their borders and up to the United States, with the intention of entering our country illegally, all payments made to them will STOP (END)!" Trump tweeted Tuesday night 
  
 Trump has repeatedly called for cuts to foreign aid in Honduras, Guatemala, El Salvador and Mexico, which, in all, obtained some $260 million in foreign aid for fiscal year 2019. ||||| LISTEN TO ARTICLE 2:14 SHARE THIS ARTICLE Share Tweet Post Email 
  
 Photographer: Pablo Martinez Monsivais/AP Photographer: Pablo Martinez Monsivais/AP 
  
 President Donald Trump’s chief of staff and his national security adviser engaged in a heated argument outside the Oval Office on Thursday, according to three people familiar with the episode. 
  
 The chief of staff, John Kelly, and the national security adviser, John Bolton, fought over immigration and border crossings, including the performance of the Homeland Security Department under Secretary Kirstjen Nielsen, one person familiar with the matter said. She was at the White House for meetings on Thursday, but the people disagreed about whether she witnessed the argument. 
  
 Bolton criticized DHS, and Kelly defended Nielsen, a former deputy whom he supported to replace him at the department. Two people described the exchange as less a shouting match than an intense argument. Kelly then stormed away, so upset that he uttered some profanities. 
  
 Bolton and Nielsen had a good conversation after Kelly and Bolton’s argument, a White House official said. Both believe the goal is to protect the border, the official said. 
  
 Trump has lately expressed fury about a large group of migrants who are traveling from Honduras toward the U.S. border. He vowed Thursday to deploy the military and shut down the Mexican border unless the migrants are turned back. 
  
 ....In addition to stopping all payments to these countries, which seem to have almost no control over their population, I must, in the strongest of terms, ask Mexico to stop this onslaught - and if unable to do so I will call up the U.S. Military and CLOSE OUR SOUTHERN BORDER!.. — Donald J. Trump (@realDonaldTrump) October 18, 2018 
  
 The clash is an indication that tension is flaring in the White House 19 days before midterm elections in which Republican control of Congress is at stake. The shouting match was so intense that other White House aides worried one of the two men might immediately resign. Neither of the men is resigning, the people said. 
  
 Trump is aware of the argument, the people said, even though the president told reporters he didn’t know about it before boarding Air Force One to travel to Montana for a campaign rally. He has recently sought to make immigration a more prominent political issue, blaming Democrats for increased numbers of migrants crossing the border. 
  
 After the confrontation was reported, White House Press Secretary Sarah Huckabee Sanders issued a statement indicating that there are no hard feelings among the president’s senior advisers. The statement didn’t address the specific details of the argument. 
  
 “While we are passionate about solving the issue of illegal immigration, we are not angry at one another,” Sanders said, adding “our Administration is doing a great job on the border.” |||||
Output:
There was shouting in the West Wing on Thursday, and it was even more intense than usual, sources tell CNN. The blowup—"profanity-laced," per Bloomberg— between Chief of Staff John Kelly and National Security Advisor John Bolton was related to an ongoing disagreement over how to handle increased crossings at the Mexico border. Sources tell CNN that Bolton took a verbal swipe at Homeland Security Secretary Kirstjen Nielsen, Kelly's former deputy at the DHS, saying she needs to start doing her job. President Trump reportedly sided with Bolton, further angering Kelly. It got so bad that startled staffers speculated that Kelly would resign, a source tells Bloomberg. Sources say that Trump is aware of the argument, although he later told reporters, "I've not heard about it. No," according to CNN, which adds that arguing is commonplace "in this divided West Wing" but the Kelly-Bolton blowup "went well beyond" what is typical. Later, a White House official said everyone had cooled off and Kelly was not going anywhere. (Trump is threatening to shut down the border.)