“If the President is looking for someone to blame on the slow pace of confirmations, he needs only to look in the mirror. There are more than 500 Senate confirmable positions. Even though it is now June, the administration has failed to select a nominee for 442 of them," Schumer said in a statement on Monday.

He added that Trump "ought to roll up his sleeves and get to work rather than pointing false fingers of blame.”

Earlier Monday, Trump blamed Democrats for slow-walking his political nominees and urged the Senate to approve more of his picks.

.@foxandfriends Dems are taking forever to approve my people, including Ambassadors. They are nothing but OBSTRUCTIONISTS! Want approvals. — Donald J. Trump (@realDonaldTrump) June 5, 2017

Democrats can't block a nominee without GOP support, but they have slow-walked many of Trump's nominees and forced even sub-Cabinet picks to overcome procedural hurdles.

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Schumer argued on Monday that senators have a "responsibility to give a thorough vetting for such important positions, with many of the nominees having conflicts of interest and incomplete ethics agreements when they were named."

Of the 559 "key positions" tracked by The Washington Post and the Partnership for Public Service , the Senate has confirmed 39 individuals and the president has nominated an additional 63.

The Senate has already confirmed five of Trump's ambassador nominations. An additional six have been formally nominated, but only one — Scott Brown to be ambassador to New Zealand — is currently ready for a Senate vote.

- This story was updated at 12:48 p.m.