The Republican National Committee is accusing Hillary Clinton of keeping questionable allies.
Sanders suggested the USA Freedom Act doesn't go far enough.
He wants new policies to "prohibit nothing" and "disclose everything."
She reportedly raised about $3 million during an earlier trip.
The senator holds a 1-percentage-point lead over Jeb Bush in new CNN/ORC poll.
It's the first time her favorability rating has been underwater since 2001.
The group will deliver a petition with 365,000 signatures asking her to run in 2016.
The South Carolina senator launched run in his home state.
He is looking for any edge that might help cut into Hillary Clinton’s huge lead.
He said his son, Rand Paul, must be "on the right track" since he’s facing so much criticism.