NEW YORK: Republican presidential contender Donald Trump vowed “strong leadership” Friday to what he called worsening race relations after five police officers were killed in Dallas. Both Trump and Democratic rival Hillary Clinton called off campaign rallies after the sniper attacks Thursday night in Dallas, which followed a spate of police killings of African Americans. “Our nation has become too divided. Too many Americans feel like they’ve lost hope,” Trump said in a statement. “Crime is harming too many citizens. Racial tensions have gotten worse, not better. This isn’t the American Dream we all want for our children,” he said. “This is a time, perhaps more than ever, for strong leadership, love and compassion. We will pull through these tragedies,” he said.