Reuters spoke to political tacticians and advisers inside and outside the White House and Congress about tell-tale signals that could come from the meeting.
The meeting is set to include Biden, McCarthy, Senate Democratic Majority Leader Chuck Schumer, Senate Minority Leader Mitch McConnell and House Democratic minority leader Hakeem Jeffries.
As invitees to the White House, they're not expected to bring any other lawmakers.
MCCARTHY, BIDEN'S TONE BEFORE AND AFTERHeading into Tuesday's meeting, Biden and McCarthy have cast one another as stubborn, misguided and, at times, dangerous.
White House officials say they want this to be a productive meeting, not just Washington theater.