Hillary Clinton makes campaign stop in Cleveland, June 13, 2016

Democratic presidential candidate Hillary Clinton waves to supporters with Ohio Sen. Sherrod Brown during a campaign stop June 13, 2016, at the Cleveland Industrial Innovation Center.

(John Kuntz, cleveland.com)

CLEVELAND, Ohio - Hillary Clinton's team is ringing in the start of the Republican National Convention by emphasizing a rift between Donald Trump and Ohio GOP leaders.

"Already, Ohio Republicans are fleeing Trump's candidacy following more than a year of words and deeds that prove he is temperamentally unfit to serve as president," Chris Wyant, director of Clinton's Buckeye State campaign writes in a Sunday memo obtained by cleveland.com.

"Ohio Republicans, just like Americans across the country are looking at Trump and deciding, we are better than this," adds Wyant, who links to several news pieces and opinion columns.

Trump's struggle to win over Republicans in this key November battleground has been well-documented. Many in the GOP establishment supported Ohio Gov. John Kasich's unsuccessful White House bid. State Sen. Shannon Jones, for example, resigned as a delegate to this week's convention bin Cleveland because she wanted no part in Trump's formal nomination.

Wyant's memo also calls attention to Trump's organizational challenges in Ohio - a byproduct of his poor relationships here. The New York businessman was weeks behind Clinton in appointing a campaign director in the state - though he ultimately snagged one of the best in Bob Paduchik, who has guided George W. Bush and Rob Portman to statewide wins.

"Public polling will show a tight race in Ohio every day up to November 8, so we are taking nothing for granted," Wyant writes. "For months, we have been working to build the kind of grassroots organization that helps Democrats up and down the ballot win close elections in Ohio and across the country. By the end of this week, the Ohio campaign will have a dozen offices open in communities around the state - with dozens more on the way."

Clinton, the presumptive Democratic nominee for president, will be in Ohio on Monday to address the NAACP's annual conference in Cincinnati. Her campaign, working with national Democrats, plans an aggressive week of counter-messaging near the convention.