While Hillary Clinton insists that Bernie Sanders' continued presence in the Democratic primary fight unites the party against Donald Trump, the presumptive Republican nominee claims Clinton's failure to knock out Sanders shows her weakness.

"Crooked Hillary just can't close the deal with Bernie," Trump tweeted Sunday evening. "It will be the same way with ISIS and China on trade, and Mexico at the border. Bad!"

Crooked Hillary just can't close the deal with Bernie. It will be the same way with ISIS, and China on trade, and Mexico at the border. Bad! — Donald J. Trump (@realDonaldTrump) May 8, 2016



Although Clinton has not officially won the Democratic Party nomination, she is on track to be named the nominee this July in Philadelphia. While Sanders is hundreds of delegates behind her, he has pledged to stay in the race as long as he can. He claims the Democratic National Committee's "overly partisan" rules favor Clinton.

Although Clinton often calls on the Democratic Party to "unify", she has never directly urged on Sanders to exit the race. During a Sunday morning interview on CBS's "Face the Nation" the former secretary of state said she is glad Sanders is focusing his efforts on attacking Trump. Clinton said she sees a "great role and opportunity for him" as a unifier.

In contrast, Trump locked up his party's nomination on Tuesday. As he prepares for a general election battle against Clinton, Trump has tried to appeal to disgruntled Sanders supporters. He often tweets that the Democratic Party treats Sanders unfairly and argues Sanders should run as a third party candidate.

In general election match-up polls Clinton would beat Trump 47.3-40.8 percent according to a RealClearPolitics average.