Doubts have been raised about the investigation in Ferguson, Mo.
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Nixon called surveillance video's release an "attempt to disparage" Brown's character.
Rep. Eliot Engel also said the U.S. should consider airstrikes in Syria.
The Texas governor cited former Obama adviser David Axelrod's support.
The Speaker said Obama's policies have not worked, but “he won’t admit that.“
Police used smoke canisters and tear gas overnight following reports of a shooting.
The police said it would not be enforced with tear gas.
"I wholeheartedly and unequivocally stand behind my veto," he said.
David Axelrod tweeted Perry's indictment was "sketchy," but Jim Messina cheered it.
Texas Gov. Rick Perry will also appear after an indictment against him was revealed Friday.