But authorities aren't sure precisely how many of the attempted attacks were successful.
Clinton responded to Trump's early morning Twitter tirade with a 3 a.m. message about national service.
Donald Trump asked former U.K. Independence Party leader Nigel Farage to help him prepare for the second U.S. presidential debate.
The Fox News host tweeted about her frustration Friday.
The Commission on Presidential Debates said Friday that Trump did, in fact, have audio issues at Monday's debate.