Ms Tlaib found support on Twitter, where #ImpeachTheMF was a trending item in the United States on Friday night, with more than 110,000 tweets.
"I'm absolutely convinced that impeachment is not dead", Rep. Al Green of Texas, a major impeachment backer, said when asked about Tlaib's comments. Pelosi is 78, while Tlaib is 42.
Rep. Ruben Gallego (D-Ariz.) was straightforward in rebuking Tlaib's comment, saying, "Everyone should stop this impeachment talk until Mueller comes out with his report".
The "motherf***er" she's referencing is President Donald Trump; the man the Left ridicules for being uncouth.
In another tweet, the president claimed that he "won perhaps the greatest election of all time" and that he has "done nothing wrong (no Collusion with Russian Federation, it was the Dems that Colluded)".
Tlaib stood by her remarks Friday morning, saying in social media post, "I will always speak truth to power".
Tlaib took her oath on a two-volume Quran that belonged to one of the founding fathers of America, Thomas Jefferson and wore a traditional Palestinian "Thobe" dress to the ceremony.
As IJR Red reported, Pelosi, who was elected speaker of the house on Thursday in the newly Democrat-run House of Representatives, sidestepped Tlaib's controversial comments and insisted it was "freedom of speech", adding that she's not in the "censorship business".
"I don't establish any language standard for my colleagues, but I don't think it's any worse than what the president has said", Pelosi said in an interview with MSNBC. Now, fellow Democrats are rebuking her vulgar remarks, calling them "inappropriate".
"The time for impeachment proceedings is now".
Tension over impeachment is likely to be a persistent thorn for Pelosi, who will have to balance between a small, vocal group of the most liberal members of her caucus, who want to see Trump removed immediately, and the majority of her members who want to wait for special counsel Robert Mueller's Russian Federation investigation to finish.
Democrats who support impeachment have argued that Mr Trump obstructed justice by firing former Federal Bureau of Investigation director James Comey, and that hush payments to at least two women made by his personal attorney during the presidential race violated campaign finance laws.
House Democrat Brad Sherman agrees, and on Thursday formally introduced impeachment measures against Trump. "We should conduct oversight, which is our responsibility, vigorous oversight, because it's been lacking the last two years".