Sen. John McCain has passed away Saturday afternoon at the age of 81 after a battle with brain cancer.

The veteran senator from Arizona served in the Senate for nearly four decades and gained a reputation as a maverick for working across party lines and voting his conscious.

Last July,  McCain was diagnosed with brain cancer around the time Congress was voting on repealing the Affordable Care Act, the Obama administration's benchmark legislation. He would return after treatment and cast the deciding vote to prevent millions from losing health care, according to the Los Angles Times. 

McCain survived five and a half years as a prisoner of war in Vietnam. He ran for president in 2008 against then young and inspiring Sen. Barack Obama. He lost the election, but he remained an ally to the administration as a senator. 

This last year was one of conflict for him. President Donald Trump would often trade barbs with the ailing elder statesmen for his defiant repudiation of the Trump administration, reports the BBC. A New York Times interview from earlier in the year revealed McCain had asked former Presidents George W. Bush and Barack Obama to eulogize him at his funeral. Trump, however, isn't welcomed. 

"His intimates have informed the White House that their current plan for his funeral is for Vice President Mike Pence to attend the service to be held in Washington’s National Cathedral," The New York Times article reads. "… But not President Trump, with whom Mr. McCain has had a rocky relationship."

After his passing, major Democratic leaders such as Rep. John Lewis, Rep. Maxine Waters and others praised McCain as a Navy veteran, war hero and American political staple.

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