Former US President Donald Trump is now in New York, on the eve of his arraignment scheduled for Tuesday.

A New York grand jury indicted Trump last week, making him the first former president to face criminal charges.

He left his home in Florida and entered Trump Tower in Manhattan on Monday. Media outlets reported that he will spend the night there.

The charge, or charges, against Trump have not been made public and are expected to be disclosed at his arraignment. Prosecutors have been investigating an alleged hush money payment to a porn star who says she had an affair with him.

Media outlets are reporting that Trump may be charged with falsifying business records. They say his company reimbursed his personal lawyer at the time for the hush money paid to the actress but listed the reimbursement in its books as a legal expense. Other reports say Trump faces multiple charges including a felony.

Trump is expected to plead not guilty when he appears in court.

In a statement released after the indictment, he said, "This is Political Persecution and Election Interference at the highest level in history."

Trump had already announced that he will run for president again next year. He is expected to return to Florida soon after his arraignment and make remarks.