The Senate approved one of 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 circuit court nominees on Thursday over the objections of his home-state senator, Sen. Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (D-Wis.).

Senators voted 49-46 to approve Michael Brennan's nomination to be a judge on the 7th Circuit Court of Appeals.

Only a simple majority was needed to approve Brennan, who appeared to have a lock on confirmation after clearing a procedural hurdle earlier this week.

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But the move enraged Democrats, who accused Republicans of bending the Senate's rules by voting on Brennan despite Baldwin not returning a "blue slip" on the nominee.

Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) called the action a "slap in the face" of Senate custom and bipartisanship.

"How is Sen. Baldwin’s right to consult on judges for her state any less important than Sen. Johnson’s? It’s mind-bending hypocrisy. It’s an appalling double standard," he said.

The "blue-slip" rule — a precedent upheld by Senate tradition — has historically allowed a home-state senator to stop a lower-court nominee by refusing to return a sheet of paper, known as a blue slip, to the Judiciary Committee.

But how strictly the precedent is upheld is decided by the Judiciary Committee chairman — in this case, Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) — and enforcement has varied over the year.

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Baldwin didn't return her blue slip for Brennan's nomination, saying he failed to win the support of a nominating commission.

Sen. Ron Johnson Ronald (Ron) Harold Johnson CIA found Putin 'probably directing' campaign against Biden: report This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda GOP set to release controversial Biden report MORE (R-Wis.) previously refused to return a blue slip for an Obama-nominee for the seat, Victoria Nourse. She eventually withdrew her nomination.

Brennan is the second circuit judge the Republican Senate has confirmed over the objections of a home-state senator.

The Senate confirmed David Stras to serve on the U.S. Court of Appeals for the 8th Circuit in January, making him the first Trump nominee to be confirmed despite a missing blue slip.

Then-Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) refused to return his blue slip on Stras's nomination. Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) returned her blue slip.

Sen. Tina Smith Tina Flint SmithThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins GOP Senate candidate says Trump, Republicans will surprise in Minnesota Biden promises Democratic senators help in battleground states MORE (D-Minn.), Franken's successor, voted against Stras's nomination.

Grassley defended his decision to move forward with circuit court nominees even if home-state senators object.

"First, it is completely false that I have 'done away' with the blue-slip courtesy. My blue-slip policy is the same as all but two of my 18 predecessors," Grassley said this week.