The Senate Governmental Affairs Committee this week is likely to reject a move by Sen. William V. Roth (R-Del.) to make his early-retirement offer part of the committee's federal pay "reform" bill.

On Tuesday, Roth will offer the White House pay plan teamed with his early-out bill. Most congressional Democrats and unions oppose both plans. The White House pay bill would give special, 8 percent raises to U.S. workers in New York, San Francisco and Los Angeles. Differentials for other cities could come later.

Committee Chairman John Glenn (D-Ohio) has his own pay bill. It would link federal and private pay locally. It does not include an early-out offer for federal workers. Because Democrats control the committee, Roth's plan is a long shot.

It would open an early retirement window this year for workers in all agencies, including the U.S. Postal Service. They could retire at age 50 with 20 years of service, at 55 with 15 years, at 57 with five years or at any age with 25 years. Opponents don't like the Roth plan because it would bar most agencies (except the Postal Service) from replacing early-outs. Politics

Federal and postal unions are asking members to contact their senators to urge them to override President Bush's veto of a bill to modify the Hatch Act. On Friday, Bush vetoed a compromise that would give federal and postal workers the right to participate in some partisan political activities on their own time. The Senate approved the bill -- but with just enough votes to override a veto. The White House plans to work on GOP senators who voted for the bill. If even one of them backs off, the Hatch Act overhaul could be dead. Week in Review

The House Appropriations subcommittee on the Treasury and Postal Service has passed a 4.1 percent January pay raise for white-collar federal workers. Bush wants the raise limited to 3.5 percent, but will probably go along if Congress insists on the slightly higher amount.

The subcommittee also approved a change that would allow agencies to pay for installation of computer-hookup phone lines in the homes of employees. That would make it possible for some people to work at home.

The ex-spouses of retired Foreign Service members have until Friday to file for pension or survivor benefits. To qualify they must have been divorced before Feb. 15, 1981, have been married during 10 years of federal service and not have remarried before age 55. For details call State's Retirement Division on Monday at 647-9315. Union Notes

Richard LaDieu is taking over as president of the U.S. Information Agency's very active local of the American Federation of Government Employees.

He succeeds Norman Painter, who is retiring after nearly eight years in the union job. LaDieu is the union's president at the Voice of America.