Senator John McCain will return to Capitol Hill to vote to keep Republican efforts to repeal Obamacare alive, Tuesday.

According to Reuters, McCain, whose office announced his battle with brain cancer last week, is set to help in the crucial decision making to either keep pushing the Obamacare repeal bill or to trash it. The senators will debate on the Senate floor on a fresh health care plan to overhaul the Affordable health care act known as Obamacare.

President Trump thanked McCain for his return in a tweet early Tuesday, he wrote; “So great that John McCain is coming back to vote. Brave-American hero! Thank you, John”.

So great that John McCain is coming back to vote. Brave – American hero! Thank you John.

— Donald J. Trump (@realDonaldTrump) July 25, 2017

McCain’s vote later today is very critical to the Republicans who have been struggling to gather enough votes to repeal the bill since April,  a loss today would mean the Senate leaders, would either find another strategy or move on to other legislative matters such as Taxes.

In a White House event on Monday, President Trump chastised the Republicans for their inability to pass the bill to repeal saying they “have not done their job in ending the Obamacare nightmare.

Vice President Mike Pence would be on the hill to step in to vote in the case of a tie.