Donald Trump’s hush-money trial will go ahead as scheduled with jury selection starting on March 25, a judge ruled on Thursday, turning aside requests for a delay from the former president’s defence lawyers.

In leaving the trial date intact, Judge Juan Manuel Merchan took advantage of a delay in a separate prosecution in Washington charging Trump with plotting to overturn the results of the 2020 presidential election.

That case has been effectively on hold pending the outcome of an appeal from Trump.

The hearing was held in the same same Manhattan courtroom where he pleaded not guilty last April to 34 counts of falsifying business records in an alleged scheme to bury stories about extramarital affairs that arose during his 2016 presidential campaign.

Trump entered the courthouse shortly before 9am.

It was Mr Trump’s first return visit to court in the New York criminal case since that historic indictment made him the first ex-president charged with a crime.

Since then, he has also been indicted in Florida, Georgia and Washington DC.

In recent weeks, he has blended campaign events with court appearances, attending a closed hearing on Monday in a Florida case charging him with hoarding classified records.

Judge Merchan has taken steps in recent weeks to prepare for a trial. If it goes off as planned, it would be the first of Mr Trump’s criminal cases to go to trial.

Over the past year, Mr Trump has lashed out at Judge Merchan as a “Trump-hating judge”, asked him to step down from the case and sought to move the case from state court to federal court, all to no avail.

Judge Merchan has acknowledged making several small donations to Democrats, including 15 US dollars to Mr Trump’s rival, Joe Biden, but said he’s certain of his “ability to be fair and impartial”.

Thursday’s proceeding is part of a busy, overlapping stretch of legal activity for the Republican presidential front-runner, who has increasingly made his court involvement part of his political campaign.

The recent postponement of a March 4 trial date in Mr Trump’s Washington DC election interference case removed a major hurdle to starting the New York case on time.

Just as the New York hearing is getting underway, a judge in Atlanta is set to hear arguments on Thursday over whether Fulton County District Attorney Fani Willis should be disqualified from Trump’s Georgia election interference case because of a “personal relationship” with Nathan Wade, a special prosecutor she hired for the case.

Mr Trump is also awaiting a decision, possibly as early as Friday, in a New York civil fraud case that threatens to upend his real estate empire.

If the judge rules against Mr Trump, who is accused of inflating his wealth to defraud banks, insurers and others, he could be on the hook for millions of dollars in penalties among other sanctions.

Along with clarifying the trial schedule, Judge Merchan is also expected to rule on key pre-trial issues, including a request by Mr Trump’s lawyers to throw out the case, which they have decried in court papers as a “discombobulated package of politically motivated charges marred by legal defects”.

Mr Trump’s lawyers, Todd Blanche and Susan Necheles, accuse Manhattan District Attorney Alvin Bragg, a Democrat, of bringing the case to interfere with Mr Trump’s chances of retaking the White House.

Mr Bragg’s predecessor, Cyrus Vance Jr, declined to pursue a case on the same allegations.

The charges are punishable by up to four years in prison, though there is no guarantee that a conviction would result in prison time.

The case centres on payoffs to two women, porn actor Stormy Daniels and former Playboy model Karen McDougal, as well as to a Trump Tower doorman who claimed to have a story about Mr Trump having a child out of wedlock.

Mr Trump says he did not have any of the alleged sexual encounters.