Sen. John McCain (R-Ariz.) said Sunday that he doesn't have an issue with Sen. Ted Cruz (R-Tex.) attempting to filibuster the debt-ceiling extension, but he also criticized Cruz for having "no plan" if the filibuster succeeded.

“I understand where Sen. Cruz is coming from," McCain said on CNN's "State of the Union," adding that he has a "cordial relationship" with Cruz.

But McCain added that "there was no plan once we had taken the United States on the brink of this financial crisis that we were approaching."

GOP leaders -- particularly in the House -- attempted to agree on what concession to seek in exchange for raising the debt ceiling, but eventually they gave in and moved forward with a "clean" bill. Cruz attempted to halt that clean bill in hopes of obtaining unspecified concessions.

The "clean" debt-ceiling bill cleared the key 60-vote threshold with limited GOP support, after more establishment-oriented senators like McCain voted to bring it to a vote. Cruz and most of the Senate GOP voted to filibuster.

McCain has clashed with Cruz in the past, labeling him and his ilk in the Senate as "wacko birds."