WASHINGTON (AFP) - Charges that United States President Donald Trump abused his power by asking Ukraine to provide dirt on his Democratic rival Joe Biden are the latest in a slew of accusations facing the leader.

Numerous lawsuits and investigations into his affairs are being carried out by Democratic-led congressional committees and by prosecutors in New York.

Here is a list of some of the legal woes facing Mr Trump.

HUSH PAYMENTS

New York prosecutors have been probing illegal pay-offs made by Michael Cohen, Mr Trump's former personal attorney, to buy the silence of at least two women, Ms Stormy Daniels and Ms Karen McDougal, who claimed to have had affairs with Mr Trump before he ran for president.

Cohen, who is currently serving a three-year prison term, is potentially a dangerous witness for Mr Trump as a long-time insider who has turned against his former boss.

The hush payments were part of a "catch-and-kill" arrangement with the National Enquirer tabloid, which, according to Cohen, had a financial arrangement to protect Mr Trump from damaging personal news.

Cohen testified that the payment he made to Ms Daniels, which was ruled an illegal use of campaign funds, was ordered and reimbursed by Mr Trump himself - a possible criminal act.

TRUMP ORGANISATION

In his February testimony in Congress, Cohen raised issues of financial malfeasance by Mr Trump and the Trump Organisation in banking and real estate deals.

Cohen said Mr Trump falsified data in financial disclosures to banks and insurance companies, providing more meat for federal investigators.

For that, eyes have been on the figure who likely knows more secrets about Mr Trump than anyone else: Mr Allen Weisselberg, the accountant who has served the Trump Organisation for four decades.

TRUMP FOUNDATION

The Trump Foundation, the former charitable arm of the Trump Organisation, is the target of a lawsuit brought by the New York state attorney-general.

The Trump Foundation agreed to shut down in December after the attorney-general accused it of engaging in a "shocking pattern of illegality".

Former New York attorney-general Barbara Underwood said the Trump Foundation was involved in "unlawful coordination with the Trump presidential campaign, repeated and wilful self-dealing, and much more".

The lawsuit names the President, his sons Donald Trump Jr and Eric Trump, and his daughter Ivanka Trump, who were on the board of the foundation.

The suit seeks US$2.8 million (S$3.85 million) in restitution and to bar Mr Trump, Don Jr, Eric and Ivanka from serving on the boards of other New York non-profits.

TAX RETURNS

Mr Trump has repeatedly refused to release his personal income tax returns and legal efforts are underway in Congress and New York to obtain them.

INAUGURATION CEREMONY

New York prosecutors are looking into the millions of dollars in funding for Mr Trump's 2017 inauguration ceremony, including whether any money was received from foreign donors.

CONGRESS

Democratic-led committees in the House have been investigating allegations of obstruction of justice, abuse of power, Mr Trump's finances, election campaign funding and other areas.

Ms Nancy Pelosi, the Democratic Speaker of the House of Representatives, announced on Tuesday (Sept 24) that the various probes being conducted by six committees would be grouped under the umbrella of a formal impeachment inquiry.

"The President must be held accountable," she said. "No one is above the law."

Special Counsel Robert Mueller concluded his probe of Russian meddling in the 2016 election without recommending any charges be filed against a sitting president.

EMOLUMENTS

Mr Trump is facing several lawsuits alleging he has used his office to enrich himself and violated the "foreign emoluments clause" of the Constitution.

The emoluments clause prohibits a president or other office-holder from profiting from their dealings with foreign governments.

Mr Trump's proposal, for example, that next year's Group of Seven summit be held at his luxury resort in Florida prompted an outcry that it would violate the clause.

The attorneys general of Maryland and Washington filed a suit over Mr Trump's continued ownership of a hotel in Washington frequented by lobbyists, company executives and foreign governments.

That suit was thrown out by an appeals court last month but a separate emoluments suit brought by Democrats in Congress is continuing.