Syria is cracking down harder than ever on the spreading anti-government protest movement. Security forces killed 18 civilians Wednesday, including an 8-year-old boy.
Witnesses say government tanks are shelling neighborhoods and security forces are detaining thousands of demonstrators.
In response, Sens. Marco Rubio (R-Fla.) and Joe Lieberman (I-Conn.) want fellow lawmakers to pass a resolution putting the United States clearly on the side of Syria's protest movement.
"For decades the rulers of Syria have been an outlaw regime," Rubio said. "They have been state sponsors of terrorism around the world, and they have been opponents of freedom at home."
"The United States and our allies cannot stand idly by while Bashar al Assad slaughters his own people," Liberman added.
Sen. John McCain (R-Ariz.) agreed saying, "If Bashar Assad is successful through the use of blood and steel to repress the legitimate aspirations of his people, that would be a lesson to tyrants throughout the world."
The National Organization for Human Rights in Syria estimates that forces there have killed more than 750 civilians since uprising broke out in March.