CNN asked all 50 GOP senators if they will support the same-sex marriage bill. Here's where they stand.

Ten GOP senators are needed to join all 50 Democrats in order to overcome a legislative filibuster in support of the House-passed bill to codify same-sex marriage into federal law. CNN asked all 50 Republicans where they stand on the legislation.

It's not yet clear how many Republicans will support the bill, but GOP and Democratic senators said Wednesday they expect it could eventually win the 60 votes needed.

Here's what we found:

Four Republican senators, so far, have either said they will support or will likely support the House-passed same-sex marriage bill, and that includes: Rob Portman of Ohio, Susan Collins of Maine, Lisa Murkowski of Alaska (likely) and Thom Tillis of North Carolina (likely).

Eight Republican senators, so far, have indicated they would vote "no," and oppose the same-sex marriage bill.

Sixteen Republican senators, so far, are undecided or did not indicate support for the House-passed bill.