(CNN) -- CNN has learned from two senior Democratic sources that former President Bill Clinton will attend the Senate Democrats' weekly luncheon Tuesday to address the caucus about health care.



A notice obtained by CNN went out to Senate Democrats saying, "All Senators should be aware that former President Clinton will be making a presentation on Health Care at tomorrow's caucus lunch. Senator Reid has requested that all Democratic Senators attend."



A constant refrain from Democratic leaders is that wavering Democrats must heed what they say is a lesson of the Clinton administration: fail to pass a health care reform bill, and congressional Democrats will suffer on Election Day.



With this visit at a critical time for health care in the Senate, the former president will be able to deliver that message in person.



Democrats in the House of Representatives approved a health care bill over the weekend.



If the Senate passes a bill, a congressional conference committee will need to merge the House and Senate proposals into a consensus version requiring final approval from each chamber before moving to President Obama's desk to be signed into law.



The House bill is more expansive -- and hence more expensive -- than the Senate Finance Committee bill. The House bill, projected to guarantee coverage for 96 percent of Americans, will cost more than $1 trillion over the next 10 years, according to the nonpartisan Congressional Budget Office.



CNN's Dana Bash, Brianna Keilar,Ted Barrett and Alan Silverleib contributed to this report.
When does the luncheon take place? What event will Clinton be attending? Who will attend Senate Democrat's weekly luncheon? Who passed health care bill over the weekend?
Tuesday Senate Democrats' weekly luncheon Bill Clinton Democrats in the House of Representatives
question: When does the luncheon take place?, answer: Tuesday | question: What event will Clinton be attending?, answer: Senate Democrats' weekly luncheon | question: Who will attend Senate Democrat's weekly luncheon?, answer: Bill Clinton | question: Who passed health care bill over the weekend?, answer: Democrats in the House of Representatives