Sen. Richard Blumenthal (D-Conn.) said Sunday that he will ask President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s Supreme Court nominee “really tough questions” on reproductive rights.

Blumenthal told New York AM 970 radio host John Catsimatidis in an interview broadcast Sunday that he has “deep and serious concerns” about Trump’s top picks for the court.

“They are on a list of generally far-right, fringe ideologues, who have been carefully vetted by groups that are listening to the president — that he will nominate someone only who will overturn Roe v. Wade … or will dismantle essential health-care rights,” Blumenthal said.

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Some conservatives have pointed to the Supreme Court seat Justice Anthony Kennedy is leaving behind as a chance to overturn Roe v. Wade, the landmark decision that legalized abortion in the U.S.

Trump has said he will not ask potential nominees about their stance on Roe v. Wade.

The Senate Judiciary Committee member added that the next justice “will be a crucial, decisive swing vote,” particularly on issues involving the president. Blumenthal pointed to the importance of the high court's decision on whether Trump could be forced to testify in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s probe or if he can pardon himself.

“On those issues I will expect this nominee to commit explicitly and specifically that she or he will disqualify themselves, in other words excuse themselves. Because there is too deep a conflict of interest,” Blumenthal said.

Trump has said that he believes he has the power to pardon himself, though he has said that he would choose not to.

The president is set to announce his nominee for the Supreme Court on Monday.