Rep. Joaquin Castro (D-Texas) is not planning to launch a bid for Sen. Ted Cruz Rafael (Ted) Edward CruzHealth care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats Jimmy Carter says his son smoked pot with Willie Nelson on White House roof MORE's (R) seat, The Washington Post reported Monday.

Castro made the decision over the weekend, according to the Post. On Sunday, he began telling close supporters and donors about his plans, according to the publication.

Castro will instead prepare to run for reelection to his House seat.

The Texas Democrat has not completely ruled out a Senate run but said he is not considering the option right now.

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An aide familiar with his thinking said Castro is aware that political developments could affect his plans down the road, according to the Post.

A poll released last month showed Castro edging out Cruz in a potential 2018 Senate matchup.

The poll found Castro with 35 percent support among Texas adults in the potential matchup, while Cruz got 31 percent.

A Democrat hasn't won a Senate race in Texas in 29 years. Cruz, who came in second in last year's GOP presidential primary, has long been considered a favorite.

Rep. Beto O'Rourke (D-Texas) officially jumped into the race to take on Cruz earlier this year. He was the first announced Democrat running to unseat Cruz in 2018.

When he entered the race, O'Rourke argued that his state needs a check on the Trump administration. In a speech in his hometown of El Paso, he said Texas needs a senator who won't use the position "to run for president, to shut down the government."