US President Donald Trump has shown no abnormal signs following a cognitive exam and is in excellent health, his White House doctor says. “I have no concerns about his cognitive ability or neurological functions,” Ronny Jackson said on Tuesday. Last week, Mr Trump, 71, had a three-hour examination in his first medical check-up since becoming US president. It comes after the release of a controversial book fuelled speculation about the president’s mental health. Speaking to reporters during a White House briefing on Tuesday, Dr Jackson said that the president’s overall health was “excellent”.