Sen. Kamala Harris Kamala HarrisJoe Biden looks to expand election battleground into Trump country Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE (D-Calif.) said Thursday that she will oppose any of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's picks for the powerful appeals courts after the administration moved forward this week with nominees for the Ninth Circuit.

"This Administration is packing the court that protected Dreamers from deportation and blocked the unconstitutional transgender military ban. We need nominees who will uphold equality and justice. Until a fair process is in place, I will oppose every nominee to an appellate court," Harris said in a tweet.

Her decision comes after Trump revived a months-long feud by nominating three judicial picks to fill three of California's seats on the Ninth Circuit.

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The San Francisco-based court has been a long-running sore spot for conservatives, who argue it is too large and too liberal. It's also acted as a foil to some of Trump's most controversial policies, including ruling against his travel ban and an effort to cut off federal funding for so-called "sanctuary cities."

The administration said Wednesday night that it would nominate Daniel Collins, Kenneth Lee and Daniel Bress to the Ninth Circuit Court of Appeals.

Harris, who is a 2020 presidential candidate and a member of the powerful Judiciary Committee, and Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.), the Senate panel's top Democrat, said in a joint statement that they were "deeply disappointed."

"We even identified candidates selected by the White House we could support to demonstrate our willingness to work cooperatively. Unfortunately, the White House is moving forward with three nominees to a circuit court who have no judicial experience. The White House’s decision to push these nominees fails to secure consensus on the circuit court," they said.

Democrats are unable to block Trump's court picks without help from Republicans after they nixed the 60-vote filibuster for most nominations in 2013. Republicans, in turn, got rid of the hurdle for Supreme Court picks in 2017.

Republicans, under Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGardner signals support for taking up Supreme Court nominee this year Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee McConnell digs in on vow to fill Ginsburg's Supreme Court seat MORE (R-Iowa), have also given nominations a vote even when a home-state senator refused to return a blue slip — a piece of paper that indicates whether or not they support a nominee.

Newly minted Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) said earlier this week that he had not yet made a decision if he will require blue slips for appeals court judges. But he indicated in a statement on Thursday that he supports the Ninth Circuit picks.

"These are highly qualified nominees and I am hopeful they will receive wide bipartisan support,” Graham said in a statement.

But, in their joint statement, Feinstein and Harris urged Graham to follow a standard set by Sen. Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Vt.), who required blue slips from home-state senators in order for a nomination to be taken up the by Judiciary Committee.

“Chairman Graham has said he wants to protect senators’ role in the nominations process. Historically, the greatest protection for home-state senators has been the blue-slip tradition," they added.