U.S. Secretary of State John Kerry told CNN Sunday he may travel to the region.
"I believe the President is asking me to go over there in very short order to work on the issue of a cease-fire," he told CNN's "State of the Union."
"Israel is under siege by a terrorist organization that has seen fit to dig tunnels and come through those tunnels with handcuffs and tranquilizer drugs, prepared to try to capture Israeli citizens and take them back to hold them hostage. No country could sit by and not take steps to try to deal with people who are sending thousands of rockets your way," Kerry said.
During one phone call with President Obama, Israeli Prime Minister Benjamin Netanyahu "had to interrupt the conversation with the President of the United States to go to a shelter. People can't live that way," Kerry said.
The United States supports Egypt's initiative for a cease-fire and "will work for a fair cease-fire," he said. The United States has "shown our willingness to try to deal with the underlying issues," but Hamas "must step up and show a level of reasonableness," he said.
"No country, no human being, is comfortable with children being killed, with people being killed, but we're not comfortable with Israeli soldiers being killed either or with people being rocketed in Israel."
"Hamas uses civilians as shields," he said. "They fire from a home and draw the fire into the home."