Democratic presidential candidate Hillary ClintonHillary Rodham ClintonOf biscuits and footballs: The perils of presidents and the nuclear codes The new Congress's opportunity to turn the tide on abortions James Franco on Trump: 'I've spiraled into a depression' MORE criticized rival Bernie SandersBernie SandersHELP Committee won't hold second hearing for DeVos McCain: Trump's withdrawal from TPP a 'serious mistake' Sanders: I'll work with Trump on trade MORE on Sunday morning, saying he doesn't have a network of advisers on foreign policy.
Clinton contrasted Sanders with a former rival, then-Sen. Barack Obama in 2008.
"In 2008, Sen. Obama had really done his homework in the Senate," she said on NBC's "Meet the Press" on Sunday morning.
"He had developed a network of advisors on national security and foreign policy issues. They will very diligent and focused on making sure he was ready, that he had as broad a set of views as possible."
But she said that's not the case for Sanders.
"There really isn't any kind of foreign policy network that is supporting and advising Sen. Sanders," she said.
"I'll let him speak for himself," she said.
"I think that what's important is this job requires you to be ready in all aspects of it on the first day and we know we got a particularly complex world right now and the president's not going to have the time," she said.
She mentioned North Korea, Russian aggression and enforcing the Iran agreement.
"You have to do it all at once," she said.