Hillary Clinton's lawyer told a federal judge Monday that the presumptive Democratic presidential nominee has already answered enough questions about her use of a private email server while serving as secretary of state.

David Kendall appeared at a hearing on whether a conservative legal group should be granted its request to interview Clinton under oath. The group, Judicial Watch, has filed multiple lawsuits seeking records related to Clinton's tenure as the nation's top diplomat from 2009 to 2013.

If allowed, a videotaped sworn deposition by Clinton would likely become fodder for attack ads in the presidential race. Republican officials have said repeatedly they plan to hammer the issue of her emails through the November election.

Kendall told U.S. District Court Judge Emmet G. Sullivan that Clinton has previously testified under oath before the congressional committee investigating the 2012 Benghazi attacks and was interviewed for hours as part of the FBI's recently closed criminal investigation. Both times Clinton said her choice to use a private server located in the basement of her New York home was motivated by convenience, not any attempt to thwart potential public-records requests.