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 ClintonHillicon Valley: Facebook civil rights audit finds 'serious setbacks' | Facebook takes down Roger Stone-affiliated accounts, pages | State and local officials beg Congress for more elections funds OVERNIGHT ENERGY: Sanders-Biden climate task force calls for carbon-free power by 2035 | Park Police did not record radio transmissions during June 1 sweep of White House protesters | Court upholds protections for Yellowstone grizzly bears GOP Miami mayor does not commit to voting for Trump 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."