Speaker John Boehner has tapped the Illinois Republican to lead the House delegation.
Jang Song Thaek was dismissed for unspecified "criminal acts," state media reported.
Baker said he was "amazed" at Mandela's soft spokenness and conviction.
"We’re in the middle of the end of the apartheid struggle now," Rev. Jesse Jackson said.
"We will not be able to stay” without security agreement, the Defense secretary said.
"Powerful sanctions and a credible military threat" are also needed, he said.
“It’s not too much to ask," the Israeli prime minister said.
“I believe the threat has become greater, not lesser,” Rep. Mike McCaul said.
“If the Iranians renege, if they cheat, then the deal is off," lawmaker said.
"I wouldn’t begin the process by conceding anything on enrichment,” Schiff said.