Marco Rubio denies Mitt Romney endorsement rumors

Update 10:35 a.m.: Marco Rubio denied a possible endorsement Sunday in an interview on CNN's State of the Union. Our original post appears below.

Former Gov. Mitt Romney (R-Mass.) will reportedly endorse Sen. Marco Rubio (R-Fla.) for president, two sources told The Huffington Post.

The 2012 Republican presidential nominee may make the move before Tuesday's caucuses in Nevada. Rubio is the party's leading establishment candidate, but he has trailed Donald Trump and Ted Cruz in early primaries and caucuses.

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