Democrats plan to challenge President Donald Trump's tariffs once the next Congress is sworn in, according to CNBC's report. The party is preparing investigations and a first-100-hours legislative push that would target Trump's tariff agenda, the report says.

Sen.-elect Abdul El-Sayed, D-Mich., told MS NOW's "Morning Joe" that Democrats "absolutely have to do immediately" to end Trump's tariff regime, especially the trade war with Canada.

Rep. Hakeem Jeffries of New York, the Democratic minority leader, said in late August that Congress should "restore congressional authority as it relates to tariffs." The report says that if Jeffries becomes House speaker, he would move legislation to the House floor that reasserts congressional authority over trade.

Rep. Jamie Raskin of Maryland, the top Democrat on the House Judiciary Committee, asked Trump on Oct. 28 for records related to tariff exemptions. Raskin alleges that Trump has used the exemption power to grant "sweetheart deals" to industries whose leaders gave the president gifts.

Sen. Ron Wyden of Oregon, who is expected to lead the Senate Finance Committee, said in a statement to CNBC that repealing Trump's tariffs on Canada would be "one of the most obvious priorities." The Wall Street Journal, citing Wyden, reported that Democrats see the Canada trade war as their "first target."

The administration already faces multiple lawsuits over its tariff policy. The most recent, filed Oct. 20, challenges Trump's use of a Great Depression-era law to impose 50% tariffs on a range of Canadian goods. Another case accuses Trump of trying to recreate the "liberation day" tariffs that the Supreme Court struck down in late February. The administration has been ordered to refund $166 billion in tariff revenue collected under that policy, the report says.

Democrats face obstacles. They lack a 60-vote filibuster-proof majority in the Senate. Overriding a presidential veto requires two-thirds majorities in both chambers, so Democrats would need Republican support. Kit Johnson, a senior tax manager at BDO, said Congress might use riders on "must-pass" bills or negotiate with the administration instead.

Trump has said he will use his veto to push Democrats toward negotiations. After the election, he told CNBC's Eamon Javers that removing tariffs would halt construction at "3,000 plants" now under construction.