President Trump spoke out Tuesday against the man who police believe shot hundreds of people in Las Vegas over the weekend, and called him a "very sick individual" whose past is being closely examined by authorities.

"He's a sick man, a demented man. A lot of problems, I guess," Trump told reporters as he left the White House on Tuesday morning for Puerto Rico.

"We are looking into him very, very seriously," Trump added.

The suspected shooter, 64-year-old Stephen Paddock, is believed to have killed himself before police breached his hotel room on Sunday evening. From his perch on the 32nd floor of Mandalay Bay, where he had been staying for several days, Paddock is thought to have killed at least 59 people and injured more than 520 others with what may have been automatic weapons. Police have said they discovered dozens of guns in Paddock's hotel room and his home elsewhere in Nevada, but have not yet described the exact kinds of firearms Paddock used or how he obtained them.

Paddock's motive has also not yet emerged, although authorities have said they do not suspect any links between the suspect and foreign terrorist organizations.

"We're dealing with a very, very sick individual," Trump said of Paddock.

The president will visit Las Vegas on Wednesday to meet with the families of victims. Although he told reporters on Tuesday that he would discuss the issue of gun control — which has burst back into the national debate due to the Las Vegas attack — in the coming days, the White House has suggested officials will not discuss gun policies until the facts of Paddock's case emerge.