Stephen Colbert started the week on The Colbert Report enraged at the "liberal hacks" at Fox News for their treatment of Rep. Paul Ryan (R-WI) on Sunday.

Ryan, the Republican candidate for vice-president, had a contentious interview with Chris Wallace over the 20 percent across-the-board tax cut he and GOP presidential nominee Mitt Romney have proposed.

Colbert brushed off a study Wallace cited saying the plan would cost the U.S. $5 trillion over 10 years.

"True, not true, who cares?" Colbert said. "It's over 10 years. Romney and Ryan will only be in office for eight of those. Let President [Michele] Bachmann worry about it in 2020. That's what hindsight is for."

Colbert was also unimpressed by Wallace's refusal to accept Ryan's explanation that the cuts were "revenue-neutral" and praised Ryan for saying it would "take too long" to explain the figures behind the proposal.

"Great answer," Colbert said. "Why is it a great answer? It would take me too long to explain, but trust me, it was a great answer."

Colbert's defense of Ryan's non-answer, aired Monday on The Colbert Report, can be seen below.