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Former Republican presidential nominee Mitt Romney came out Tuesday against Donald Trump's proposal banning all Muslims from entering the United States, siding with House Speaker Paul Ryan in the process.

In a tweet, Romney said that Trump "fired before aiming" with his proposal, adding that the response by Ryan, his 2012 running mate, is "on target."

During a press conference early Tuesday, Ryan pushed back against Trump's proposal. The Wisconsin congressman argued that it "is not conservatism," adding that it's not what the GOP or the country believes.

"[It] is not conservatism. What he proposed yesterday is not what the party stands for and more importantly is not what the country stands for," Ryan told reporters.

"The vast, vast, vast majority of Muslims are peaceful and believe in pluralism, freedom, democracy and individual rights," Ryan argued.

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