UPDATE 11:30 a.m.
Congressional aides say confirmation hearings for two of the nominees have now been delayed.
The Senate intelligence committee will now question Donald Trump's nominee for CIA director, Rep. Mike Pompeo, (R-Kansas) on Thursday instead of Wednesday and the confirmation hearing for Betsy DeVos, Trump's pick for Education Secretary, will be held next week, Business Insider reports.
WATCH | Nine of Donald Trump's cabinet nominees will have hearings on Capitol Hill this week as Senate Republicans move quickly to tee-up their confirmations. But several of them will face tough questioning. Here's a look at who's stepping into the ring this week and what to expect.
Dems trying to delay
Senate Democrats are demanding for the hearings to be delayed until Trump's nominees are fully vetted by the Office of Congressional Ethics (OGE).
The director of the OGE sent Democratic leaders a letter raising concerns because they have yet to receive basic financial disclosure records from several of the nominees, including tax returns.
Senate Majority leader Mitch McConnell said all nominees would be fully vetted.
Tough fights ahead
Several of the nominees, like Sen. Jeff Sessions, Gen. James Mattis and Ben Carson will face intense questioning this week.
Trump's pick for Secretary of State, Rex Tillerson, could be in for an especially rough hearing. Even Republican lawmakers have raised concerns over the Exxon Mobil CEO's close ties to Russia.
Losing battle for Democrats
Try as they might, Democrats will have a very tough time blocking the nominees since they did away with their own "nuclear option" back in 2013.
Senate rules used to require at least 60 votes to confirm Cabinet nominees, but Democrats muscled through a rule change in 2013 to keep Republicans -- who were then in the minority -- from derailing a confirmation.
Now it just takes a simple majority vote. Not a problem for Republicans who have 52 seats in the Senate.
Here's the schedule for this week's confirmation hearings.