WASHINGTON >> Their power ebbing, Senate Democrats launched a last-minute drive Saturday to confirm roughly 20 of President Barack Obama’s nominees, and several Republicans blamed tea partyer Ted Cruz for creating an opening for the outgoing majority party to exploit.

The weekend session unfolded as measures that could prevent government operating funds from running out at midnight remained in limbo. Even so, there was little apparent concern about a shutdown that Democratic and Republican leaders said they wanted to avoid.

Republicans tried to slow the nomination proceedings, but several voiced unhappiness with Cruz, R-Texas. One likened his actions to his role in precipitating a 16-day partial government shutdown more than a year ago.

“I’ve seen this movie before, and I wouldn’t pay money to see it again,” Sen. Johnny Isakson, R-Ga., said between seemingly endless roll calls.

Cruz blamed the Democrats’ leader, Sen. Harry Reid of Nevada, saying his “last act as majority leader is to, once again, act as an enabler” for the president by blocking a vote on Obama’s policy that envisions work visas for an estimated 5 million immigrants living in the country illegally.

Cruz, a potential presidential candidate in 2016, said Reid was “going to an embarrassing length to tie up the floor to obstruct debate and a vote on this issue because he knows amnesty is unpopular with the American people, and he doesn’t want the Democrats on the record as supporting it.”

Democrats lost control of the Senate in the November, and Republicans will take over when the new Congress convenes in January.

With the midnight deadline nearing, the administration budget office said it was “working with agencies and taking steps to prepare for a potential lapse in funding, but believes Congress has enough time to pass a full-year budget bill and keep the government operating.”

Lawmakers in both parties said the $1.1 trillion spending measure eventually would pass. It faced opposition from Democratic liberals upset about the repeal of a banking regulation and Republican conservatives unhappy that it failed to challenge Obama’s immigration moves.

Immigration was the issue that Cruz cited late Friday night when he tried to challenge the bill. That led swiftly to the unraveling of an informal bipartisan agreement to give the Senate the weekend off, with a vote on final passage of the bill deferred until early this coming week.

That, in turn led Reid to call an all-day Senate session to be devoted almost exclusively to beginning time-consuming work on confirmation for as many as nine judicial appointees and an unknown number of nominees to administration posts.

The list included Carolyn Colvin to head the Social Security Administration, Vivek Murthy to become surgeon general, Sarah Saldana as head of Customs and Immigration Enforcement and Antony Blinken to the No. 2 position at the State Department.

Democrats did not provide a complete list, saying it might change. More than a dozen judicial nominations remained on the Senate’s calendar, and dozens of appointees to administration positions.

Several Republicans fumed that Cruz had erred.

Asked if Cruz had created an opening for the Democrats, Sen. Orrin Hatch, R-Utah said, “I wish you hadn’t pointed that out.”

Hatch added, “You should have an end goal in sight if you’re going to do these types of things and I don’t see an end goal other than irritating a lot of people.”

Added Sen. Jeff Flake, R-Ariz.: “I fail to see what conservative ends were achieved.” He also said he was worried about what the events means for next year, when Republicans are in charge.

“The other concern I have here now is the nominations that are going to get through that otherwise wouldn’t,” said Sen. John Hoeven, R-N.D.

Appearing irritated, some Republicans spoke with Cruz on the Senate floor about his actions. At another point, Cruz huddled in the rear of the chamber with Sen. Mike Lee of Utah, who had supported him on Friday evening, and Sen. Rand Paul of Kentucky, another tea party-backed lawmaker.

The GOP leader, Kentucky Sen. Mitch McConnell, made no public comment on the events, even though Cruz suggested Friday night McConnell and House Speaker John Boehner, R-Ohio, should not be entirely trusted to keep their pledge to challenge Obama’s immigration policy when Republicans gain two-house control of Congress in January.

“We will learn soon enough if those statements are genuine and sincere,” Cruz said.

The $1.1 trillion spending bill provides funds for nearly the entire government through the Sept. 30 end of the current budget year.

The sole exception is the Department of Homeland Security, which is funded only until Feb. 27. Republicans intend to try then to force the president to roll back his immigration policy that removes the threat of deportation from millions of immigrants living in the United States illegally.

The events quickly overshadowed developments in the House earlier in the week, when Democratic divisions were on display over the spending bill.

House Democratic leader Nancy Pelosi of California opposed the bill, and publicly chastised Obama for giving it his support.

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Associated Press writer Darlene Superville contributed to this story.