President Donald Trump said Tuesday that the U.S. will "be talking about gun laws as time goes by" in the wake of the Las Vegas shooting, the nation's deadliest in modern history.

Trump plans to visit Las Vegas Wednesday to meet with the victims' families, as well as first responders. "This is just very bad".

"The whole country stands united in our shock, in our condolences, and in our prayers", said Congressman Paul Ryan, Speaker of the US House of Representatives.

Tell me, if your child were a victim, would you just shrug your shoulders and say there is nothing anyone can do? Chris Murphy of CT, have sought to press fellow lawmakers into action, however.

The gunman who attacked a Las Vegas country music festival installed cameras outside his hotel room, including at least one in a room-service cart, to watch for the approach of police officers, Clark County Sheriff Joe Lombardo said Tuesday. "It's not who we are".

Trump, however, has not always waited to inject politics into a mass shooting.

Senator Elizabeth Warren, a Democrat from MA, added:"Tragedies like Las Vegas have happened too many times", she posted in Twitter.

Almost a year later, evidence indicated the plane "most likely broke up in midair after a fire near or inside the cockpit that quickly overwhelmed the crew", the New York Times reported. "This must stop - we must stop this".

Mark Kelly called gun violence an "epidemic" and denounced the gun silencer bill in a news conference Monday.

Some Senate leaders seem skeptical of making it more hard to purchase guns in the U.S.

Scalise, a Louisiana Republican, returned to the Capitol last week after he was shot and critically wounded in June as he and fellow Republicans practiced for a congressional baseball game. House Majority Leader Kevin McCarthy said he and Rep. Mark Amodei, a Nevada Republican, also would make the trip.

Before the fact, he would have been hard to profile, to target as a potential mass shooter.

In all his Senate career Murphy has been an anti-Second Amendment crusader, so much so that his websites greet you with the message "Congress must pass comprehensive legislation to make our communities safer from gun violence". Lewis asked. "This (gun violence) must stop and it must stop now".

Some say the issue is not with the guns, but with mental health.

"Without action, we are asking one person to be the next person to die because of our weakness to address evil", Kelly said.

"It's not legal to purchase a fully automatic weapon, but it's not that hard to convert legal semiautomatic weapons so that they are fully automatic", he said.

"This is on every congressperson who said in '13: There is simply nothing we could do", Márquez-Greene wrote, adding in a separate tweet: "We need sensible gun legislation and we need it now".