Sen. Marco RubioMarco RubioCruz wins bulk of delegate spots at Va. convention Trump seeks approval from foreign policy experts, but hits snags Many Republicans uninterested in being Trump’s VP: report MORE (R-Fla.) on Tuesday backed freshman Rep. Tom CottonTom CottonOvernight Finance: House rejects financial adviser rule; Obama rebukes Sanders on big banks Overnight Energy: Dems block energy spending bill for second day Senators roll out changes to criminal justice bill MORE (R-Ark.) for the Senate in his first endorsement of the 2014 cycle.
The endorsement comes with a twist, as Cotton is a strident opponent of the bipartisan immigration bill that Rubio helped pass through the Senate.
Rubio said Cotton would stick to his guns if elected to the Senate from Arkansas.
"He won't stand down when it comes to repealing ObamaCare, fighting to lower our runaway debt, and turning back the tide of big government that has taken over Washington in recent years."
Rubio and Cotton have similar political profiles.
Both are staunch fiscal conservatives bouyed by the Tea Party movement, and have been embraced by Washington's GOP establishment.
The two men also have hawkish views on foreign policy that are at odds with the libertarian streak that has taken hold in the GOP.
Cotton is running against Sen. Mark PryorMark PryorEx-Sen. Kay Hagan joins lobby firm Top Democrats are no advocates for DC statehood Ex-Sen. Landrieu joins law and lobby firm MORE (D-Ark.) in a must-win race for Senate Republicans if they hope to regain control of the upper chamber.