Senate Majority Leader Harry ReidHarry Mason ReidMcConnell not yet ready to change rules for Trump nominees The Hill's Morning Report — Sponsored by CVS Health — Trump’s love-hate relationship with the Senate Trump to press GOP on changing Senate rules MORE (D-Nev.) rescheduled a cloture vote on one of President Obama’s nominees because not all of the senators had returned from a constituent workweek.

“We have a number of senators who are not going to be here tonight,” Reid said Monday. “It’s just not right that we have a few people who make things very difficult for everyone.”

Reid said he knew of at least five senators — Republicans and Democrats — who were going to miss the vote, but he didn’t name names. He accused them of not taking Monday votes seriously and warned that he was going to schedule more in the coming weeks.

The Senate was suppose to vote on whether to end debate on the nomination of Richard Griffin to serve as general counsel to the National Labor Relations Board (NLRB). That vote will now occur some time Tuesday.

Reid also filed several cloture motions of other Obama executive branch and judicial nominees. The Senate will work on nominations all week.

Reid said earlier Monday, that Republican obstructionism has held up "crucial" nominees.

“It is no secret that Republicans have systematically slow-walked or blocked scores of President Obama’s judicial and executive branch nominees,” Reid said ahead of the vote. “It is time to move forward – without delay – and fill these crucial posts.”