Sen. Tim Scott to endorse Rubio
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South Carolina Sen. Tim ScottTimothy (Tim) Eugene ScottOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Senators grill ex-Equifax CEO over stock sales Wells Fargo chief defends bank's progress in tense Senate hearing MORE (R) is expected to endorse Sen. Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers 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 GowdyCummings demands documents about Conway's flights with Price Dems call for 'emergency' hearing on Trump's hurricane response Democrats unveil bills to ban Cabinet members’ private jet travel 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 Olin GrahamDurbin: I had 'nothing to do' with Curbelo snub Republicans jockey for position on immigration Overnight Health Care: House passes 20-week abortion ban | GOP gives ground over ObamaCare fix | Price exit sets off speculation over replacement MORE, South Carolina's other senator who ended his own presidential bid in December, is backing Bush.

Updated at 9:47 p.m.