The Senate has become embroiled in bitterness and name-calling less than two weeks after Inauguration Day.

The usually genteel chamber of Congress has been anything but recently amid controversial directives from the White House, Democratic opposition to President Trump’s political appointees and protests around the country.

Democrats on Tuesday slowed the pace of confirming Trump’s Cabinet nominees to a crawl, outraging Republicans, who accused them of unprecedented obstruction. The tactical move triggered a leading Republican to label Democrats “idiots.” Meanwhile, a liberal Democrat accused one of Trump’s Cabinet picks of lying to the Senate.

And the Supreme Court battle hasn’t really gotten started yet.

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Democrats boycotted a meeting of the Senate Finance Committee, preventing scheduled votes on Trump’s picks to head the Treasury and Health and Human Services departments. They also filibustered a vote on Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.), nominated for attorney general, in the Judiciary Committee, forcing Republicans to adjourn the meeting without action.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellGOP ramps up attacks on Democrats over talk of nixing filibuster MLB owner: It's 'very necessary' to vote for Trump Delta: Early departures saved flight attendants' jobs MORE (R-Ky.) blasted Democrats for intentionally causing “chaos” and called their behavior “foolish.”

“They’re manufacturing issues on a daily basis to drag this process out and to treat this president’s initial Cabinet appointments differently from the way we’ve treated presidents of the Democratic Party in similar circumstances,” McConnell fumed at an afternoon press conference.

McConnell said Republicans were not enthusiastic about President Obama’s Cabinet picks in 2009 “but we did not prevent him from getting up and functioning.”

“Totally different treatment by the Senate majority at the beginning of Obama from what we’re experiencing here,” he said.

On his first day in office, six of Obama’s Cabinet nominees were confirmed.

As of Tuesday afternoon, senators had confirmed only three Trump Cabinet members: James Mattis as secretary of Defense, John Kelly as secretary of Homeland Security and Elaine Chao as secretary of Transportation.

The Senate has also confirmed Mike Pompeo to serve as CIA director and Nikki Haley to serve as U.S. ambassador to the United Nations.

Senate Finance Committee Chairman Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah) appeared furious after Democrats refused to show up to the meeting he scheduled on Steven Mnuchin and Rep. Tom Price (R-Ga.), Trump’s selections to lead the Treasury and Health and Human Services departments, respectively.

“I think they ought to stop posturing and acting like idiots,” grumbled Hatch, the Senate’s president pro tempore and normally one of the chamber’s most decorous members.

“I’m very disappointed in this kind of crap,” he said. “Some of this is because they just don’t like the president.”

Democrats, however, argued the guerilla tactics were warranted after The Wall Street Journal reported Monday that Price received a special opportunity to buy a biomedical stock at a bargain price, contradicting his congressional testimony.

Sen. Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat GAO clears way for Democrats to try to overturn Trump's payroll tax deferral TikTok, Oracle seek Trump's approval as clock ticks down MORE (Ore.), the senior Democrat on the Finance Committee, said Price “misled Congress and he misled the American people.”

They also pointed to the new revelation that Mnuchin, a former CEO of OneWest, wasn’t upfront about whether the bank had auto-signed mortgage documents. Democrats say records show it used the practice in Ohio despite Mnuchin’s assertion to the contrary.

Sen. Sherrod Brown Sherrod Campbell BrownEmboldened Democrats haggle over 2021 agenda 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-Ohio), another member of the Finance panel, said Democrats had “great concern” that Hatch asked them to vote on two nominees “who out and out lied to our committee.”

Democrats say Trump’s Cabinet picks have taken a long time to process because several of them are billionaires and have huge agglomerations of assets that require many hours to review.

They also blame the selections, particularly Betsy DeVos, Trump’s choice to head the Department of Education, for not submitting their paperwork for vetting until relatively late in the process.

“Their nominees were not vetted soon enough,” said one Senate Democratic aide who faulted Trump’s transition team for lagging in its duties.

The battle over the Cabinet nominees sets up an even more bitter battle over Trump’s Supreme Court pick.

Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.), one of the Senate’s most liberal members, said this week he would filibuster Trump’s nominee no matter who it was because Republicans blocked Obama’s nominee, Merrick Garland, for nearly a year after conservative Justice Antonin Scalia died.

Tempers reached a boiling point Tuesday after a month of wrangling over the confirmation schedule. Democrats cried foul earlier this month when McConnell tried to schedule six confirmation hearings on one day.

McConnell and Republican committee chairmen agreed to delay some of the hearings after Senate Democratic Leader Charles Schumer Chuck SchumerOvernight Health Care: Schumer calls for Azar to resign over 'chaos' in coronavirus response CNBC's Cramer calls Pelosi 'crazy Nancy' in live interview Schumer calls for Azar to resign over 'chaos' in coronavirus response MORE (N.Y.) dug up a letter McConnell wrote in 2009 demanding that Democrats not move Obama’s nominees until the Office of Government Ethics had enough time to vet them.

The Senate’s slow pace has complicated Trump’s ability to execute his policies. On Monday, the president fired acting Attorney General Sally Yates after she directed Department of Justice personnel not to enforce his executive order on immigrants and refugees.

Trump may have avoided that imbroglio had Sessions, a fierce advocate for strict limits on immigration, already been confirmed.

The leadership vacuums at the tops of various departments have coincided with what some Republicans see as a breakdown of loyalty and discipline throughout lower-ranking offices.

White House press secretary Sean Spicer warned on Monday that “career bureaucrats” should “either get with the program or they can go” after State Department officials circulated a document questioning Trump’s executive order on refugees.

Four senior State Department officials resigned suddenly last week in what was seen as a protest of Trump’s policies.

The Associated Press reported that career officials across the government were “biting back” at the president by tweeting messages at odds with his agenda from official social media accounts and leaking information to the media.

Meanwhile, a senior Democratic aide said Rex Tillerson, Trump’s nominee to serve as secretary of State, is likely to be confirmed Wednesday.

Democrats feel they are riding a wave of momentum since a devastating election. And they are taking evident delight at GOP infighting over Trump’s order on refugees. Seven GOP senators have announced opposition to the order, and 18 have expressed some level of concern over it.

“During the first week and a half of the Trump administration, the White House has been untruthful, incompetent and at times un-American,” Schumer told reporters Tuesday.

Peter Schroeder contributed.