Rep. Joaquin CastroJoaquin CastroFeehery: A better than even shot of flipping a Texas district Lawmakers call for investigation into proposed AT&T WarnerMedia, Discovery merger Israel says blacklisted NSO Group 'has nothing to do' with government policies MORE (D-Texas) is reportedly closing in on a bid to challenge Sen. John CornynJohn CornynAll hostages free, safe after hours-long standoff at Texas synagogue: governor McConnell will run for another term as leader despite Trump's attacks Republicans threaten floor takeover if Democrats weaken filibuster MORE (R-Texas) for his Senate seat in 2020.
Texas Monthly reported Friday that the San Antonio Democrat is “all but certain” to enter next year’s Senate contest, citing a source familiar with his thinking.
Matthew Jones, a campaign adviser to Castro, said in an email that the congressman “will have an announcement in the near future.”
If Castro enters the race, he would become the first high-profile candidate to mount a campaign against Cornyn, a three-term Republican and former Senate majority whip with a well-financed political operation.
Cornyn's campaign closed out 2018 with a nearly $5.8 million campaign bank account.
Meanwhile, Castro’s House campaign finished the year with $128,000 on hand, according to his most recent filing with the Federal Election Commission (FEC).
Cornyn's campaign office said it was looking forward to a potential challenge from Castro.
"Whether it’s Hurricane Harvey relief or the Green New Deal, time and again Congressman Castro has stood with Nancy PelosiNancy PelosiPelosi suggests filibuster supporters 'dishonor' MLK's legacy on voting rights The Hill's Morning Report - Presented by Facebook - Democrats see victory in a voting rights defeat GOP senator knocks Biden for 'spreading things that are untrue' in voting rights speech MORE at the expense of Texans,” said John Jackson, Cornyn's campaign manager, in a statement.
“John Cornyn looks forward to contrasting the Democrat-Socialist agenda with the policies that have made Texas the best state to live, work, and raise a family.”
Castro has been floated for months as a potential challenger to Cornyn. But speculation of a Senate campaign had been overshadowed recently by rumors that former Rep. Beto O’Rourke (D-Texas), whose 2018 challenge to Sen. Ted CruzRafael (Ted) Edward CruzGolden State Warriors owner says 'nobody cares' about Uyghurs All hostages free, safe after hours-long standoff at Texas synagogue: governor Overnight Energy & Environment — Lummis holds up Biden EPA picks MORE (R-Texas) drew intense national attention, could look to take on Cornyn instead.
O’Rourke ended months of speculation about his political future on Thursday, announcing that he would run for president in 2020 and leaving the Democratic field in the Texas Senate race wide open.
Among O'Rourke's fellow hopefuls for the White House nomination is Castro's twin brother, former Housing and Urban Development Secretary Julián Castro.
News of a possible Senate announcement comes a day after the Senate passed a resolution overturning President TrumpDonald TrumpSanders calls out Manchin, Sinema ahead of filibuster showdown Laura Ingraham 'not saying' if she'd support Trump in 2024 The Hill's 12:30 Report: Djokovic may not compete in French Open over vaccine requirement MORE’s national emergency declaration seeking funding to construct his long-promised wall along the U.S.-Mexico border.
That vote was seen as a victory for Castro, who initiated the resolution in the House. It passed in the lower chamber last month.
Trump vetoed the measure on Friday, the first veto of his presidency.
-- Updated at 6:32 p.m.