Clinton Campaign Manager Robby Mook Denounces 'Vague' Letter on Emails

Robby Mook, Hillary Clinton's campaign manager, sounded a note of cautious optimism about the election on Sunday's news shows, saying he doesn't think Friday's release of potentially new information about State Department emails would affect the Democratic nominee's chance of winning.

"We had our best Saturday ever fundraising yesterday," Mook, the first openly gay man to run a major party's presidential campaign, told Chuck Todd on NBC's Meet the Press, after Todd had noted a surge in fundraising for Republican nominee Donald Trump's campaign. "We had 50,000 volunteers were out knocking on doors and turning our supporters out to the polls. We actually felt a surge of support and momentum as well."

On both Meet the Press and Fox News Sunday with Chris Wallace, Mook expressed encouragement about Clinton's chances in swing states such as Nevada and North Carolina, and even longtime Republican strongholds like Arizona. "Donald Trump's divisive rhetoric, the shameful things he's said about POWs and specifically about John McCain [Arizona's senior U.S. senator, a Republican] have put that state into play," Mook told Wallace. He stressed, though, that the campaign is taking nothing for granted.

Mook also denounced what he called the vagueness of the letter FBI director James Comey sent to 16 members of Congress Friday about the emails. The FBI in July closed its investigation of Clinton's use of a private email server when she was secretary of State, saying it found no evidence that anyone had intentionally mishandled classified information.

But Comey said Friday that the FBI had discovered some emails that may be pertinent to the investigation. His letter did not say where the emails were found or who sent and received them, but other sources said they were uncovered during an investigation of former Congressman Anthony Weiner's sending of sexually explicit messages to a teenage girl. Weiner's estranged wife, Huma Abedin, was a top aide to Clinton at the State Department. Comey's letter alone does not mean the investigation will be reopened.

Mook called on Comey to release more information. "I think the issue here is that if he doesn't come out and get all the information on the table he's going to let anyone, any conspiracy theory, take the day," Mook told Todd.

"It was three paragraphs," the campaign manager added. "It didn't provide any details whatsoever. He said there were some emails. He didn't know if they were significant or not."

Watch both interviews below.