WASHINGTON — Democratic senators plan to aggressively target eight of Donald Trump’s Cabinet nominees in the coming weeks and are pushing to stretch their confirmation votes into March – an unprecedented break with Senate tradition.

Such delays would upend Republican hopes of quickly holding hearings and confirming most of Trump’s top picks on Inauguration Day. But Democrats, hamstrung by their minority status, are determined to slow-walk Trump’s picks unless they start disclosing reams of personal financial data they’ve withheld so far, according to senior aides.

Incoming Senate Minority Leader Charles Schumer, D-N.Y., has told Senate Majority Leader Mitch McConnell, R-Ky., that Democrats will hone in especially on Rex Tillerson, Trump’s choice for secretary of state; Sen. Jeff Sessions, R-Ala., Trump’s choice for attorney general; Rep. Mick Mulvaney, R-S.C., tapped to lead the Office of Management and Budget; and Betsy DeVos, set to serve as education secretary.

There’s also Rep. Tom Price, R-Ga., Trump’s pick to lead the Department of Health and Human Services and oversee changes to Obamacare, who is set to be attacked by Democrats for his support for privatizing Medicare. Andrew Puzder, a restaurant executive set to serve as labor secretary, will face scrutiny for past comments on the minimum wage, among other policies. Steve Mnuchin, a former Goldman Sachs partner set to serve as treasury secretary, and Oklahoma Attorney General Scott Pruitt, Trump’s pick to lead the EPA, will also be the focus of Democratic attacks, aides said.

“President-elect Trump is attempting to fill his rigged cabinet with nominees that would break key campaign promises and have made billions off the industries they’d be tasked with regulating,” Schumer said in a statement Sunday confirming his caucus’s plans. “Any attempt by Republicans to have a series of rushed, truncated hearings before Inauguration Day and before the Congress and public have adequate information on all of them is something Democrats will vehemently resist. If Republicans think they can quickly jam through a whole slate of nominees without a fair hearing process, they’re sorely mistaken.”

Absent from the Democratic hit list are retired Marine Gen. James N. Mattis, set to serve as defense secretary; South Carolina Gov. Nikki Haley, who Trump has nominated to serve as ambassador to the United Nations; and John Kelly, a former Marine general and Trump’s selection to lead the Department of Homeland Security, signaling that all three should expect little trouble from Democrats.

Senate confirmation hearings are scheduled to begin next week, when the Judiciary Committee is due to hold two days of hearings with Sessions, and the Foreign Relations Committee is scheduled to hold a one day, two-part hearing with Tillerson.

But Schumer has told McConnell that he wants at least two days of hearings for each of these eight nominees, including at least one panel made up of witnesses that can speak to the pick’s past record, aides said. At each hearing, members of the committee would get at least 10 minutes to ask questions, with no limits on multiple rounds.