McCaskill: FBI Probe Exists Because There Was ‘Legitimate Question’ Whether Clinton Broke Law

Sen. Claire McCaskill (D., Mo.) admitted Tuesday morning there was a "legitimate question" of whether Hillary Clinton had broken the law with her use of a private email server.

McCaskill, a vocal Clinton supporter, appeared on MSNBC's Morning Joe, and co-host Mika Brzezinski asked her why the federal probe into the Democratic nominee's email practices was reopened.

"Because the reason there's an investigation is because they found on this computer metadata that indicated the server was on this computer, and so out of an abundance of caution, they want to take a look at it," McCaskill said. "I have no quarrel with that."

Democrats have been criticizing FBI Director James Comey since he sent a letter to members of Congress on Friday stating that the bureau had relaunched its investigation into Clinton. The announcement came after FBI agents uncovered relevant new information while investigating former Rep. Anthony Weiner (D., N.Y.) for allegedly sexting with an underage girl. Weiner's now estranged wife is senior Clinton aide Huma Abedin. FBI investigators found emails that may be related to Clinton's time as secretary of state.

Brzezinski asked McCaskill why the email investigation was launched in the first place, not just the recent announcement from Comey.

"The overall investigation exists because there was a legitimate question as to whether or not Hillary Clinton had done something against the law as it related to classified emails," McCaskill said. "Now they have a few more emails to look at."