A key U.S. official landed in Cairo on Monday to meet with military leaders and discuss the extra aid promised by Washington to help Egypt with its democratic transition.

Undersecretary of State for Political Affairs William Burns arrived days after Secretary of State Hillary Rodham Clinton announced Egypt would be receiving an extra $150 million to help with the political transition.

The $1.5 billion in foreign aid the U.S. gives annually to Egypt, which is unchanged in the State Department's budget request released last Monday, was a point of criticism that arose in Congress during the 18 days of protests against the reign of Hosni Mubarak.

Sen. Dick Lugar (Ind.), ranking Republican on the Foreign Relations Committee, said Sunday on CNN's "State of the Union" that Egypt needs the extra cash because its economy "is in the tank."

“Our assistance here may be the most influential thing we can do,” Lugar said.

Unrest in Egypt has cost the country about $1.5 billion in lost tourism revenue, according to bank officials in the country.

"We respect and admire what has been achieved — but we know that the way ahead is not going to be easy," Burns told reporters.

British Prime Minister David Cameron on Monday became the first foreign leader to visit Egypt since the Mubarak ouster.