Kentucky senator has competing interests if he wants to run for reelection and president.
Clinton in 2008 said Iowa's rules prevented many people from participating.
"It's not easy when you're governor having to take over a moribund economy," he said.
Perry said it was “beyond belief” that Congress was leaving for recess.
It's unclear whether the president and Clinton will meet during their separate trips.
Sen. Cruz will attend a meeting of influential Iowa Republicans.
Online channel to take on "mainstream media" costs $9.95 a month and $99.95 per year.
Some lawmakers in Congress are too focused on ideological ideals, she said.
Sen. Rand Paul outlined reforms geared toward improving conditions for minorities.
Bush said existing laws allow too many people to stay in U.S. as they await hearings.