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Sen. Marco Rubio took to Twitter to join the #NeverTrump movement

Rubio quickly took the opportunity to push the movement into the spotlight and label Trump as a "con artist"

Washington CNN  — 

A Twitter push to oppose Donald Trump’s presidential bid has gained a high-profile fan: Marco Rubio.

The Florida senator, who has tussled with the billionaire since Thursday’s CNN Republican debate, joined the #NeverTrump movement on Twitter.

READ: Trump: ‘Rubio stole from the Republican Party’

“Donald Trump is a con artist – and he cannot be our nominee. #NeverTrump” Rubio tweeted on Friday.

The Twitter hashtag has supporters from across the political spectrum – including conservatives – vowing to oppose Trump should he win the Republican nomination.

“#NeverTrump. Agree? Add your name here” Rubio tweeted. The link brings users to Rubio’s campaign site.

And Rubio wasn’t letting up Saturday morning as he fired off more tweets using the hashtag.

“It’s time to take the mask off Donald Trump. #NeverTrump.”

Rubio made many of the same points at a Saturday press gaggle. He sought to deflect concerns that he’s yet to win a contest while Trump has won New Hampshire, South Carolina and Nevada after a second place finish in the Iowa caucuses.

“Our party, after four states have voted, according to all the polls, is on the verge of being taken over. The party of Lincoln and Reagan is on the verge of being taken over by a con artist named Donald Trump,” Rubio told reporters.

On Friday, Rubio mocked Trump for spelling errors in his tweets, including the word “choker” several times. In his Saturday comments, Rubio went after Trump in the most personal terms.

“He’s learning how to spell,” Rubio said. “But he’s flying around on ‘Hair Force One’ and tweeting. So here’s the one tweet he put out. He put out a picture of having makeup put on me at the debate. Which is amazing to me that the guy with the worst spray tan in America is attacking me for putting on makeup. Donald Trump likes to sue people. He should sue whoever did that to his face with that.”

During a Saturday campaign appearance, at Mt. Paran Christian School in Kennesaw, Georgia, Rubio told the audience of several thousand that his office has received calls from former Trump University students claiming to have been defrauded by the mogul.

And Rubio’s keeping up his anti-Trump Twitter efforts. He wrote Saturday afternoon: “Donald Trump will never be the nominee of the party of Lincoln and Reagan. #NeverTrump.”

RELATED: Rubio mocks Trump for ‘wet’ pants

CNN’s Lauren Selsky contributed to this report.