UPDATE 1:38 p.m.
Top Senate Republicans on Wednesday urged the White House to withdraw Andrew Puzder's nomination for Secretary of Labor, citing increasing skepticism among GOP Senators.
At least six senators have publicly said they are on the fence about Puzder. At least four have said they won't vote for him, but there could be as many as 12 Senators planning to vote against Puzder, CNN reported.
WATCH | Two more down. On Monday, the Senate confirmed two more of President Trump's cabinet members, but they are gearing up for a fight over Trump's pick for Labor Secretary Andrew Puzder.
GOP's shaky support
At least four Republican senators have said they are unsure if they will support Puzder's nomination.
Sens. Susan Collins of Maine, Lisa Murkowski of Alaska, Tim Scott of South Carolina and Johnny Isakson of Georgia have all told GOP leadership that they have serious concerns about the fast food CEO's nomination.
That poses a serious problem for Majority leader Mitch McConnell (R-Kentucky) who is now scrambling to secure enough votes to confirm Puzder.
Two of the same senators, Murkowski and Collins, opposed Betsy DeVos' nomination.
She was confirmed in a rare tie-breaker vote by Vice President Mike Pence.
More scandals ahead of hearing
Puzder's confirmation hearing has already been delayed several times over a few controversies, including his admission that he hired an undocumented housekeeper.
This week Senators reviewed a 1990 episode of "The Oprah Winfrey Show" in which Puzder's ex-wife appeared in disguise and accused him of physical abuse.
Lise Fierstein, Puzder's former wife, has since retracted those allegations.
Elizabeth Warren's battle plans
The Massachusetts Senator released a 28-page letter she sent to Puzder this week with 83 questions about possible his conflicts of interest, labor discrimination lawsuits, and why he has opposed minimum wage laws.
"Your company's record of prolific labor law abuses and discrimination suits the most of any major burger chain gives me great pause given that as Labor Secretary you'd be charged with enforcing these very laws,” Warren wrote.
The letter, which serves as a blueprint for her plan of attack Puzder's hearing, comes less than a week after Warren was silenced on the Senate floor while filibustering the nomination of Jeff Sessions for Attorney General.
Democrats ready to fight
Senate Democrats are eyeing Puzder as their best chance for derailing one of Trump's nominees.
Minority Leader Chuck Schumer (D-New York) has even called on the fast food tycoon to withdraw his name from the nomination.
"Candidate Trump campaigned as a champion for the working people, he has nominated for labor secretary someone who is so anti-working people that it’s appalling," Schumer told reporters Monday.