President Donald Trump rallied his grassroots supporters in a conference call on Monday designed to celebrate his 500 days in office but it turned into a bashing session on Hillary Clinton and John McCain.

'You remember Hillary Clinton calling everybody deplorables? We were the deplorables,' Trump said on the call with grassroots Republican activists, according to Buzzfeed News. 'Well the deplorables, we're the hot ones right now. They're all trying to figure out how do we get the deplorables on our side, right? So we're all deplorables together.'

President Donald Trump rallied his grassroots supporters in a conference call on Monday

President Trump bashed Senator John McCain for his deciding no vote on repealing Obamacare last year

President Trump reminded supporters that Hillary Clinton called them deplorables but said deplorables, 'we're the hot ones right now'

Republicans from across the country were on the monthly call, which Trump usually does not participate in himself.

In September 2016, Clinton told supporters at a fundraiser half of Donald Trump's supporters belong in a 'basket of deplorables' - a remark Trump pounced on when it was leaked.

Clinton later apologized for the remark and after the election noted she had given a 'political gift' to Trump.

On Monday's call, the president also renewed his attacks on Senator John McCain who has been away from Congress battling a deadly form of brain cancer.

Trump remains upset that McCain, whom he did not mention by name, cast a critical vote against a health care overhaul bill last year.

'We had it done except for one vote, and that one vote was a very sad situation — thumbs down,' said Trump, recalling McCain's gesture from the floor during the vote.

'We had it except for that one horrible vote at 3 o'clock in the morning,' Trump added a minute later. 'You remember that. We all remember it well.'

The president made a similar criticism of McCain to the party faithful at the Conservative Political Action Conference in February, hounding the senator for his no vote.

McCain created a dramatic moment in July 2017 when he cast the deciding vote against the Republicans' 'skinny repeal' for the Affordable Care Act in the early morning hours.

Trump warned his backers against complacency this election year amid Republican fears they could lose control of the House of Representatives.

He said Democrats were angry, a warning to Republicans it could motivate the other side to come out in droves to vote.

'They are angry — the other side is really, really angry,' he said. 'They're energized, and not for good. They're energized for a lot of bad things to happen.'