Most retweeted GOP convention tweet was written by Clinton

The most retweeted tweet during the first day of the Republican National Convention was posted by the GOP's chief opponent.

"Republicans have a lot of nice things to say — when it's not an election year. Thanks, Mayor Giuliani. #RNCinCLE," presumptive Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonJill Stein: 'I am not a Russian spy' Trump criticizes Clinton for suggesting Jill Stein was Russian asset Graham: I'm seeking to make Trump successful 'but not at all costs' MORE tweeted Monday night.

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In the tweet, Clinton quoted former New York City Mayor Rudy Giuliani, who said of Clinton in 2010: "I think she is doing a good job. ... I have tremendous respect for her."

The Republican National Convention kicked off Monday.

Giuliani spoke shortly before Clinton's tweet, as part of the GOP's theme of "Make America Safe."

In his speech, the former New York City mayor tore into Clinton's "vicious, nasty campaign."