Georgetown University's Center for Strategic and International Studies has withdrawn as a sponsor of a conference on U.S.-Philippine relations after discovering that another sponsoring organization is closely linked to Philippine President Ferdinand Marcos.

The conference, to be held tomorrow, comes just five days before Marcos arrives here to meet with President Reagan. The Philippine leader has been criticized for human rights violations and repressive policies at home and his visit is expected to be a controversial one.

Critics of the CSIS conference charged in an Aug. 31 letter to the Rev. Timothy Healey, Georgetown's president, that noill in Broward County."

Although only about 300 elderly people in his district work directly for the program, Shaw said, it "literally touches" thousands of older citizens across Florida, where the elderly carry sizable political clout. Eleven of the 15-member Florida delegation voted against Reagan yesterday, including Shaw and Rep. Bill McCollum (R-Fla.), both of whom have backed the president in previous budget fights.

In recent weeks, senior citizens groups had alerted their members to the possibility that the program would close down Sept. 30 if Reagan's veto of the "regular" supplemental appropriations bill was upheld. And that possibility "very definitely affected" the Florida delegation's voting, Shaw said.

Even though White House lobbyists urged him to back Reagan again, Shaw said the pleas ran against his own feeling that "it's tough to come back and tell a member to change position in an election year. That can be a good issue for your opponent."

McCollum said he decided to vote to override the veto because he didn't think the appropriations bill was a "budget-buster" as Reagan claimed.

"I wasn't busting a thing," he said. "I hope the president will veto a lot of appropriations bills," if they do exceed the budget, he added.

Other Reagan allies found other reasons to vote against the