michael reagan
Michael Reagan, son of former President Ronald Reagan, says he fears for President-elect Donald Trump's safety. Reagan is pictured here at the National Rifle Association's 139th annual meeting in Charlotte, North Carolina, May 14, 2010. Chris Keane/Reuters

Former President Ronald Reagan’s son, Michael, tweeted Thursday he is concerned over President-elect Donald Trump’s safety.

President Reagan was shot and seriously wounded March 30, 1981, as he exited the Washington Hilton Hotel in the nation’s capital. The gunman, John Hinckley Jr., thought he could impress actress Jodie Foster with the action. He was sentenced to a mental facility but was declared competent and freed in September.

Michael Reagan tweeted he is concerned about Trump because “my father was shot by a crazy, there are more now.”

Trump has a personal bodyguard, former New York Police detective Keith Schiller, and is planning to install him at the White House, People.com reported. Politico reported last month Trump plans to continue using private security after he is sworn in, an arrangement that breaks with tradition. All modern presidents and presidents-elect have trusted the Secret Service to for their safety.

Trump spent more than $1 million on security during his campaign, Federal Election Commission reports showed. Trump’s security force traveled the country, supplementing the Secret Service and policing his campaign appearances.

Schiller joined the Trump organization in 1999 and became director of security in 2004.

Protecting Trump could get costly, especially if he decides to spend time in New York. Officials say it costs $500,000 a day to protect the president-elect.

New York Police have asked Congress for $35 million to reimburse the city for costs of protecting Trump during the transition period, but so far, only $7 million has been offered, John Miller, deputy commissioner of intelligence and counterterrorism, told WNYM, New York, in mid-December.

“It’s not fair to New York City because ... this is an unfunded federal mandate," he said.

"We really won’t be able to gauge the long-term costs … until we know: Is he coming home every weekend? Is he stopping in on week nights? Is he taking vacations here?”

Four U.S. presidents have been assassinated: Abraham Lincoln, James Garfield, William McKinley and John F. Kennedy. There have also been a number of attempted assassinations, the first against Andrew Jackson in 1835 outside the Capitol. Attempts also were made against William Howard Taft, Theodore Roosevelt, Herbert Hoover, Franklin Roosevelt (which resulted in the death of Chicago Mayor Anton Cermak), Harry S. Truman, Richard Nixon, Gerald Ford, Jimmy Carter, Reagan, George H.W. Bush, Bill Clinton, George W. Bush and Barack Obama.