Pentagon adviser Richard Perle said the recent Israeli attack in Syria was long overdue and expected US military action against Damascus.
Perle, a close adviser to US President George Bush and Defence Secretary Donald Rumsfeld, was speaking on Tuesday at a Jerusalem conference of conservatives from the United States and Israel.
"I was happy to see that Israel has now taken a similar step in responding to acts of terror that originate in Lebanese territory by going to the rulers of Lebanon in Damascus," said Perle, a Washington hawk.
Israel launched an attack on Syria earlier this month, on what it claimed was a training camp for the Palestinian Islamic Jihad group.
The resistance group strongly denied it maintained training camps outside the occupied West Bank and Gaza Strip, saying Israel attacked a civilian area.
It was Israel's first deep attack in Syria since the 1967 Arab-Israeli war.