Sen. Joe Manchin (D-WV) came out against President Joe Biden's nominee for the Federal Communications Commission, imperiling Senate approval and casting doubt on the administration's plans for net neutrality and regulations.

Manchin criticized FCC nominee Gigi Sohn on Tuesday, claiming that her years of activism for Democratic causes, online inflammatory remarks, and partnerships with select left-leaning groups justify opposing her appointment.

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Without support from Manchin, Sohn's odds of getting approval are low due to a 51-49 partisan split in the Senate. Democrats would need to maintain the support of all the remaining Democratic senators and have them present for a vote — a condition that has been elusive in recent weeks.

"Especially now, the FCC must remain above the toxic partisanship that Americans are sick and tired of, and Ms. Sohn has clearly shown she is not the person to do that," Manchin said in a press statement. "For those reasons, I cannot support her nomination to the FCC, and I urge the Biden Administration to put forth a nominee who can bring us together, not drive us apart."

Republican lawmakers have opposed Sohn's appointment, alleging that she is a left-wing ideologue who favors heavy-handed regulation, censorship of conservatives, and net neutrality. Some conservatives initially expressed support for her based on her advocacy for more diversity in broadcasting, but GOP resistance to her nomination hardened over the course of the past year.

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Sohn was first nominated in 2021, but her nomination stalled last year when Democrats had only 50 senators.

Sohn was grilled by Sen. Ted Cruz (R-TX) at her third nomination hearing on Feb. 14 over her donations to Democratic causes. The nominee said the "relatively small" gifts were done as the actions of "a citizen who just wanted to participate in the democratic process."