Sen. John McCain (R-Ariz.) on Monday apologized to Democrats for a Republican attempt to block progress on the National Defense Authorization Act (NDAA), and said that blocking is helping to make the Democratic argument that filibuster reform is needed in the Senate to help move bills along more quickly.

McCain spoke on the Senate floor Monday afternoon, and told his Democratic colleagues that the "senator from Kentucky" will object to any more unanimous consent agreements until his particular amendment is considered. McCain didn't say it was Sen. Rand Paul (R-Ky.), but Paul has previously said he would hold up work on the NDAA over language about the ability to detain terrorist suspects.

McCain then apologized for the delay, and said the blocking effort could be making an argument for filibuster reform.