Trump: 'We are a divided nation'
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Presumptive Republican presidential nominee Donald TrumpDonald TrumpSenate rejects attempt to block Biden's Saudi arms sale Crenshaw slams House Freedom Caucus members as 'grifters,' 'performance artists' Senate confirms Biden's nominee to lead Customs and Border Protection MORE on Sunday targeted President Obama's leadership and presumptive Democratic nominee Hillary ClintonHillary Diane Rodham ClintonBen Affleck: Republicans 'want to dodge the consequences for their actions' through gerrymandering Republican Ohio Senate candidate slams JD Vance over previous Trump comments Budowsky: Why GOP donors flock to Manchin and Sinema MORE.

"Look what is happening to our country under the WEAK leadership of Obama and people like Crooked Hillary Clinton," Trump tweeted early Sunday.

"We are a divided nation."

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Trump often slams the president and his likely rival for their records.

His tweet comes after five police officers were killed and seven others were injured in a shooting Thursday night in Dallas during a protest prompted by the police-involved deaths of two black men, Philando Castile in Minnesota and Alton Sterling in Louisiana, earlier in the week.

Castile and Sterling were fatally shot by police officers in incidents caught on camera and viewed widely on social media.

The incidents have spurred protests across the country.