Rep. Julia Letlow is seriously considering mounting a primary challenge against Sen. Bill Cassidy, her fellow Louisiana Republican, according to three GOP sources familiar with the matter. And she has received encouragement from the White House to jump into the race, two sources said. Letlow, 44, has been weighing her options carefully over the past few months but has not put a timeline on making a decision, though sources say she has grown more serious about the idea of running for the Senate.

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