House Minority Leader Robert H. Michel (R-Ill.) notified Speaker Jim Wright (D-Tex.) yesterday that Republicans strongly oppose a plan to bring a multibillion-dollar Democratic welfare bill to the floor as part of an omnibus reconciliation bill, which includes hundreds of other issues, rather than as a separate measure.

"Welfare reform is too impor- tant to be included in any legis- lative package," Michel and 20 other Republicans involved in welfare issues said in a letter to Wright yesterday.

"We urge you to bring welfare reform to the floor prior to the end of the {1987} session separately and not as part of any other omnibus legislative package," they told Wright in the letter.

They said the issue deserves "full congressional debate" and opportunity for the House to consider the GOP's welfare bill, which they said would be more effective and cost only $1.1 billion over five years instead of the $5.9 billion they estimated for the Democratic bill approved by the Ways and Means Committee.

In recent weeks Democrat- ic leaders have made clear that they are considering putting the Democratic version in an omnibus reconciliation bill, where, among other things, it would be less vulnerable to a veto. Rep. Thomas J. Downey (D-N.Y.), chairman of the Ways and Means subcommittee on public assistance, told a National Alliance of Business meeting two weeks ago that if it were a separate bill,

"the president would clearly veto

it, so we are not going to run that risk."

The reconciliation bill will lay out federal savings and spending for fiscal 1988.

The Democratic and GOP

versions of the welfare bill include major training, remedial education and work requirements for welfare mothers, but the Democratic version also includes a number of major improvements in welfare benefits. The Republicans contend these improvements would make it more desirable for people to stay on welfare and therefore discourage welfare clients from seeking work.

Wright aides said late yesterday that he had made no decision on the Michel request.

But an aide to Ways and Means Chairman Dan Rostenkowski (D-Ill.) said the chairman thought it makes more sense to include the Ways and Means bill in the omnibus reconciliation measure, which would also include the money to pay for the welfare changes. He added that Rostenkowski feels that even as part of the reconciliation bill, a full debate on the welfare issue is possible.

In the Senate, Finance Committee Chairman Lloyd Bentsen (D-Tex.), according to aides, would prefer to handle the issue as a free-standing measure instead of in the reconciliation bill. Sen. Daniel Patrick Moynihan (D-N.Y.), the sponsor of a major welfare bill costing $2.3 billion over five years that has 55 cosponsors, said, "I would very much look forward to seeing just what version the House members put in reconciliation, but this

shows their seriousness, and that's good."