Brentwood - Talking tough on illegal immigration and violent crime, President Donald Trump appeared on Friday to advocate rougher treatment of people in police custody, speaking dismissively of the police practice of shielding the heads of handcuffed suspects as they are being placed in patrol cars."Don't be too nice," Trump told law enforcement officers in Suffolk County, New York, during a visit to highlight his administration's efforts to crack down on the street gang known as MS-13. The violent international group has terrorised communities on Long Island and in other parts of the country.The president urged Congress to find money to pay for 10 000 Immigration and Customs Enforcement officers "so that we can eliminate MS-13".Trump said his administration is removing these gang members from the United States but said, "We'd like to get them out a lot faster and when you see ... these thugs being thrown into the back of the paddy wagon, you just see them thrown in, rough, I said, 'Please don't be too nice.'"Trump then spoke dismissively of the practice by which arresting officers shield the heads of handcuffed suspects as they are placed in police cars."I said, 'You could take the hand away, OK,'" he said, drawing applause from many in the audience, which included federal and law enforcement personnel from the New York-New Jersey area.The Suffolk County Police Department said in a statement after Trump's speech that it has strict rules and procedures about how prisoners should be handled. "Violations of those rules and procedures are treated extremely seriously. "As a department, we do not and will not tolerate roughing up of prisoners."