Trump shooting updates: Shooter flew drone near site hours before shooting

Former first lady Melania Trump released a statement Sunday morning, saying, "When I watched that violent bullet strike my husband, Donald, I realized my life, and Barron's life, were on the brink of devastating change. I am grateful to the brave secret service agents and law enforcement officials who risked their lives to protect my husband."

"A monster who recognized my husband as an inhuman political machine attempted to ring out Donald’s passion -- his laughter, ingenuity, love of music, and inspiration," she said. "The core facets of my husband’s life -- his human side -- were buried below the political machine. Donald, the generous and carrying man who I have been through the best of times and the worst of times."

"When the time comes to look beyond the left and the right, beyond the red and the blue, we all come from families with the passion to fight for a better life together, while we are here, in this earthy realm," she said.

She closed, "Dawn is here again. Let us reunite. Now."

"The winds of change have arrived. For those of you who cry in support, I thank you," she went on. "I commend those of you who have reached out beyond the political divide -- thank you for remembering that every single politician is a man or woman with a loving family."

-ABC News’ Kelsey Walsh

The roof where the suspected gunman fired shots at former President Donald Trump had been surveyed during security preparations for the event, a law enforcement source told ABC News.

The roof was empty during those security preparations, the source said.

As reports of suspicious activity came in, a search was initiated, the source said. It was unclear how the suspect climbed onto the roof to quickly get off shots before a Secret Service counter-sniper located and killed him, the source said.

Officials continue on Sunday to investigate whether the dead suspect was connected to domestic extremists, the source said. The early investigation turned up no ties to international terrorism, the source said.

-ABC News' Pierre Thomas and Luke Barr

Sen. Josh Hawley, R-Mo., formalized his calls for the Senate Homeland Security Committee to investigate the attack on Trump in a letter to committee Chairman Gary Peters Sunday morning.

"I call on you to launch a full, public, and comprehensive committee investigation into this assassination attempt and failures to adequately protect the president," Hawley wrote.

Because Republicans are in the minority in the Senate, Peters, D-Mich., is required to call a hearing for it to proceed.

Former Vice President Mike Pence issued an updated statement Sunday morning condemning political violence.

"Karen and I thank God that President Trump is safe and recovering following yesterday's attempted assassination and are grateful for the swift response by Secret Service that undoubtedly saved lives. We are praying for his full recovery and for those lost and injured in this horrific attack. There is no place in America for political violence and it must be universally condemned," he wrote in a post on X.

-ABC News Kelsey Walsh