The estimated cost for guarding US President Donald Trump, his family and their Manhattan residence has been lowered by the city of New York.

Police Commissioner James P O'Neill has written to New York's Congressional delegation to seek reimbursement.

He said it cost about 24 million US dollars (£19.2 million) to guard the Trumps and Trump Tower during the two-and-a-half months between election day and inauguration day.

The original estimate was 35 million US dollars (£28 million).

When the president is not in New York, the department estimates that it costs between 127,000 US dollars (£102,000) and 146,000 US dollars (£117,000) a day to protect the first lady and their son.

If Mr Trump is in New York city, the Police Department puts the estimate at 308,000 US dollars (£246,000) a day.

The New York Times noted that Mr Trump has not yet returned to the city since his inauguration.