Bernie Sanders mocked Donald Trump on Twitter and reminded the outspoken president that his inauguration crowd was still smaller than Obama's.

In light of the multiple protests held against Trump and his administration, the president said if the millions of voters who helped 'make America great again' had their own rally it 'would be the biggest of them all', in a tweet on Saturday.

Sanders disagreed and in a simple comeback he posted comparative photos of the crowds at Trump's inauguration and Obama's ceremony and said: 'They did. It wasn't'.

Bernie Sanders shut down Trump on Twitter after the president claimed that if his supporters had a rally 'it would be the biggest of them all' on Saturday

Sanders shared a photo of the crowd at Trump's inauguration next to Obama's 2009 inauguration and simply said: 'They did. It wasn't'

Trump previously boasted of his large inauguration crowd size (left) but experts quickly rushed to confirm that Obama's 2009 inauguration (right) of 1.8 million people beat Trump's figures of less than 600,000 people

The epic dig from Sanders was met with waves of praise from supporters and since has reignited the senator's election campaign rally cry of #FeelTheBern.

Twitter users have retweeted the response, which has now gone viral, and one user chimed in, asking if Trump 'needed some ice' from Sander's burn.

In the past, Trump has made his disapproval of the crowd size comparisons be known and even suspended the Interior Department's digital team shortly after the National Park Service retweeted the contrasting photos.

The billionaire had previously boasted of his historic inauguration crowd size, but his claims were quickly dispelled after Obama's 2009 inauguration was proven to be much larger.

Trump took office in January and his administration has since issued several controversial measures, causing protests and disapproving comments from other politicians, including Sanders (right)

Experts have estimated that between 300,000 and 600,000 people came to Trump's inauguration, compared to Obama's 1.8 million.

White House Press Secretary Sean Spicer told reporters during a press conference that 720,000 people appeared to have been present.

Washington DC's Metro also gave numbers that suggest fewer people came to Trump's inauguration than both of Obama's ceremonies.

As of 11am on Trump's Inauguration Day, 193,000 trips had been taken this year, compared to 513,000 in 2009 and 317,000 in 2013. On the day of George W. Bush's second inauguration, 197,000 trips had been taken by 11am.

Since Trump took office his administration has issued several controversial measures, causing weeks of protest in the United States and internationally.

Not only have ordinary citizens picked up protest signs, but Hollywood stars have also joined in to denounce Trump.

The epic dig from Sanders was met with praise from supporters and since has reignited the senator's election campaign rally cry of #FeelTheBern

Sander's simple comeback has went viral and has more than 70,000 retweets

With the Academy Awards scheduled for Sunday, A-listers such as Jodie Foster, Michael J. Fox and Keegan Michael Key have headlined a protest over Trump's recent immigration orders.

The stars were among 1,200 people to take part in the rally organized by the United Talent Agency on Friday outside its headquarters in Beverly Hills.

UTA, one of the world's largest talent agencies, chose to scrap its annual pre-Oscars party in protest at Trump's immigration travel ban and to show its support for freedom of speech and artistic expression.

With the Academy Awards scheduled for Sunday, Hollywood has also waded into the political dispute. Jodie Foster (left) and Michael J. Fox (right) headlined a protest over Trump's recent immigration orders in Los Angeles on Friday

Taking to the rally stage, Foster said she's never been comfortable using her public face for activism and has always found the small ways to serve, but that this year is different.

'It's time to show up,' she said. 'It's a singular time in history. It's time to engage. And as the very, very dead Frederick Douglass once said 'any time is a good time for illumination'.'

'It doesn't matter where you born, who you voted for... All the colors in the identity rainbow - this is our time to resist,' she said.

'It is the time to show up and demand answers. It's all of us trying to tell our elected officials to do their job.'

