Prime Minister Binyamin Netanyahu spoke with top US senators and congressmen over the weekend, in an effort to find a timely solution to the Iranian nuclear issue. In his conversations with top officials including House Speaker Nancy Pelosi, which came as a second uranium enrichment plant near Teheran was revealed, he stressed the urgency of the situation. Earlier Saturday, Foreign Minister Avigdor Lieberman said that the newly exposed Iranian nuclear facility proves "without a doubt" the Islamic Republic is pursuing nuclear weapons, said Saturday. AFP quoted him as urging immediate action, saying, "Without wasting time, we must work towards the overthrow of the mad regime of Teheran." Iran kept the facility, located 100 miles southwest of Teheran, hidden from the UN nuclear watchdog until revealing it last week. Israel has long sounded alarm bells over what its belief that Iran is looking to develop nuclear weapons. "This removes the dispute whether Iran is developing military nuclear power or not and therefore the world powers need to draw conclusions," Lieberman told Israel Radio. "Without a doubt it is a reactor for military purposes not peaceful purposes," Lieberman said. Lieberman said he met with Arab foreign ministers while at the United Nations last week and said they expressed their alarm over Iran's nuclear program to him. "Nobody is worried about the Palestinian problem, everybody in the Muslim and Arab world and first and foremost in the [Persian] Gulf states are worried about the Iranian problem," Lieberman said.