You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

Da Nang, Vietnam (CNN) President Donald Trump suggested on Saturday he's done confronting Russian President Vladimir Putin over his country's election meddling since it's insulting to the Russian leader. Trump said he took Putin at his word that Russia did not seek to interfere in the US presidential election last year, despite a finding from US intelligence agencies that it did. The fraught relations between the two leaders was underscored anew when Putin's spokesman initially said election meddling did not come up when they spoke, even though Trump said it did. And he stressed that bigger issues persist between the United States and Russia that require the two leaders to move on."He said he didn't meddle," Trump saidTrump spoke to reporters aboard Air Force One in Vietnam 
 Question:As _ has traveled abroad, the special counsel investigation looking into possible collusion between his campaign aides and Russia has crept closer to Trump's inner circle.
Output:
Donald Trump