Donald Trump has been found guilty of all 34 counts of falsifying business records in a criminal hush-money scheme to influence the outcome of the 2016 election.

The verdict came after a jury deliberated for less than twelve hours in the unprecedented first criminal trial against a US president. It marks a perilous political moment for Trump, the presumptive nominee for the Republican nomination, whose poll numbers have remained unchanged throughout the trial but could tank at any moment.

Trump was convicted by a jury of 12 New Yorkers of felony falsification of business records, which makes it a crime for a person to make or cause false entries in records with the intent to commit a second crime.

In Trump’s case, the Manhattan district attorney’s office alleged Trump falsely recorded the reimbursements he made to his former lawyer Michael Cohen, who paid the adult film star Stormy Daniels $130,000 for her silence about her affair with Trump, as “legal expenses”.

The prosecution alleged the falsifications were made to conceal Trump’s violation of New York state election law, which makes it a crime to promote the election of any person to office through unlawful means.

Prosecutors argued in part that those unlawful means were the $130,000 payment to Daniels, which was in effect an illegal campaign contribution, because it was done solely for the benefit of his 2016 campaign and exceeded the $2,700 individual contribution cap.

The Manhattan district attorney’s office called 20 witnesses who, over the course of four weeks, gave evidence of how Trump plotted with the tabloid mogul David Pecker and Cohen to bury accounts of affairs with Daniels and the Playboy model Karen McDougal.

The witnesses – some friendly to Trump, others openly hostile – said Trump’s worry over the Daniels story intensified after the October 2016 release of the infamous Access Hollywood tape, in which Trump was caught on a hot mic bragging about sexual assault.