The Russian foreign minister called the decision to impose sanctions "unconstructive."
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'You don’t really have to talk about it. If you talk about it too much, you lose your credibility. And you have to be taken seriously,” said Marine Corps Gen. Jim Jones, who served as Obama’s national security adviser for two years.
Clinton has expressed support for the administration’s diplomatic effort in recent days.
“I don’t know what her political future is, whether she’s going to run,” he said.
Graham will be just as vocal after he wins his primary, he said.
The poll conflicts with a few other recent surveys.
Clinton said it would be inappropriate to comment on an issue under State Department review.
Obama made the warning at a Democratic National Committee fundraiser in Boston.
She supports the administration’s call on Russia to refrain from using force.
The Senate Foreign Relations Committee is set to host him Thursday as well.