Sen. Tim Scott to endorse Rubio
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South Carolina Sen. Tim ScottTim ScottRepublican lawmakers criticize Trump response to Charlottesville Trump turns on GOP Congress Reporter drops notebook, hits GOP senator on head during late-night session MORE (R) is expected to endorse Sen. Marco RubioMarco RubioScarborough: Trump has chosen the 'wrong side' THE MEMO: Trump reignites race firestorm RNC spokeswoman: GOP stands behind Trump's message 'of love and inclusiveness' MORE (R-Fla.) for president on Tuesday, according to a report from Politico.

Scott would be Rubio's second congressional endorsement from South Carolina. Rubio also has the support of Rep. Trey GowdyTrey GowdyCongressional investigations — not just special counsels — strengthen our democracy These 5 House Republicans are ripping their Senate colleagues over healthcare House Intelligence Republican: Claims Gowdy acted as second lawyer for Kushner 'horses---t' MORE (R-S.C.), the chairman of the House committee investigating the 2012 Benghazi attacks.

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Scott is the only black Republican in the U.S. Senate, and his endorsement could give Rubio a boost in the first Southern primary state.

Rubio has the support of 28 lawmakers, according to The Hill's tally of congressional endorsements. That's good for second place, behind former Gov. Jeb Bush (Fla.), with 31.

Lindsey GrahamLindsey GrahamGraham: Trump's Charlottesville rhetoric 'dividing Americans, not healing them' OPINION: Congress should censure Trump for his unfit conduct Supporting 'Dreamers' is our civic and moral duty MORE, South Carolina's other senator who ended his own presidential bid in December, is backing Bush.

Updated at 9:47 p.m.