Presidential candidate Julián Castro (D) said Thursday that his brother Rep. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas) is considering a 2020 Senate run.

“He’s considering that, but he really has not made a decision about whether he’s going to do that. I would imagine he would make a decision at some point soon,” Julián Castro, who was the Housing and Urban Development secretary under President Obama, told The Associated Press during a campaign stop in Nevada.

ADVERTISEMENT

No clear Democratic front-runner has emerged to challenge Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas) in 2020.

Former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas), who came within 3 percentage points of defeating Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) in 2018, will reportedly not challenge Cornyn, and instead likely run for president.

O'Rourke said he had met with Senate Minority Leader Charles Schumer (D-N.Y.) about a potential second Senate run.

Joaquin Castro, who is serving as the campaign chairman for his brother, is the chairman of the House Hispanic Caucus and sponsored a measure passed Tuesday to block President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's emergency declaration over the border wall.

Cornyn has comfortably won reelection every year since being elected in 2003, but many Democrats believe shifting demographics could mean he is vulnerable this time around.

“I think he’d beat him. My brother would win,” Julián Castro said.

“There are a lot of Texans that clearly have problems with the way that he has represented the state. Most recently, refusing to stand up to Trump even though a lot of land is going to get taken, a lot of Texas landowners’ property is going to get taken if there’s a wall.”