With less than three weeks to go before they take control of the U.S. House of Representatives, Democrats are jockeying to lead overlapping investigations into President Donald Trump in a scramble that could cause headaches for Nancy Pelosi, who is expected to be House speaker.

The investigations will be led by as many as six different House committees with some falling under the possible jurisdiction of two or more, Democratic congressional sources said.

The main areas of investigation include Trump's tax returns and business properties; any collusion between his campaign team and Russian interference in the 2016 election; any violations of a constitutional clause that forbids the president from accepting gifts from foreign governments without the consent of Congress; and allegations that he broke campaign finance laws with hush money payments to two women who said they had sex with him.