Kentucky Republicans line up behind Paul
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Sen. Rand PaulRandal (Rand) Howard PaulGOP lays debate trap for 2020 Democrats Overnight Defense: Trump says he doesn't need exit strategy with Iran | McConnell open to vote on Iran war authorization | Senate panel advances bill to restrict emergency arms sales Senate panel advances bill to restrict emergency arms sales MORE (R-Ky.) will have the support of nearly all of the Kentucky GOP delegation, as he launches his bid for the White House. 

Kentucky GOP Reps. Thomas Massie, Andy BarrGarland (Andy) Hale BarrDemocrats set to use McConnell's legislative graveyard against him 58 GOP lawmakers vote against disaster aid bill Dying on the track: Horse racing is at a crossroads MORE and Brett GuthrieSteven (Brett) Brett GuthrieOvernight Health Care — Campaign for Tobacco-Free Kids — Poll finds Trump vulnerable on health care in battleground states | HHS must respond to petition on abortion referral ban by Thursday | Wyden presses health officials about CBD regulations Lawmakers map out path forward on Medicare Part D The Hill's Morning Report - In exclusive interview, Trump talks Biden, Iran, SCOTUS and reparations MORE told The Hill on Monday they will back Paul's presidential run and will be on hand for his Tuesday announcement in Louisville.

A representative for Rep. Ed WhitfieldWayne (Ed) Edward WhitfieldWhy Republicans took aim at an ethics watchdog What Azerbaijan wants from Israel? Overnight Energy: Green group sues Exxon over climate science MORE (R-Ky.) responded to a question about whether he would endorse Paul in 2016 by saying he would be at the launch event on Tuesday.

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Rep. Hal Rogers (R-Ky.) has a policy of not getting involved in primaries, but a representative said he wishes Paul well and will support whoever the eventual GOP nominee is.

In December, Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's Morning Report - Democratic debates: Miami nice or spice? Democrats leery of Sanders plan to cancel student loan debt GOP lays debate trap for 2020 Democrats MORE (R-Ky.) said he would “almost certainly” back Paul should he seek the White House, although it’s yet to be seen how active the Senate majority leader will be on the campaign trail.

“I'm going to be helpful to him in any way I can be,” McConnell said at the time. “But I'm not going to be tromping around in New Hampshire and Iowa. I can tell you that.”

Paul provided crucial support to McConnell's 2014 reelection as he faced a Tea Party challenger. 

With the majority of Kentucky Republicans in his pocket, Paul will be looking for support on Capitol Hill from those outside of his home state, and particularly in early voting states.

National Journal reported on Monday that Reps. Justin AmashJustin AmashThe Hill's 12:30 Report: New revelations from Trump's exclusive sit-down with The Hill Democrats: Ex-Commerce aide said Ross asked him to examine adding census citizenship question Amash after Trump says he doesn't need Congress's approval to strike Iran: 'Constitution: Wrong' MORE (R-Mich.), Raúl Labrador (R-Idaho) and Mark Sanford (R-S.C.) will support Paul and will appear with him at rallies later this week.

Paul is expected to announce his bid for the White House on Tuesday in Kentucky and will follow that up with trips to New Hampshire, South Carolina, Iowa and Nevada.

— This story was updated at 8:36 a.m.