The Pakistan Taliban has claimed responsibility for an attack on the Karachi Airport academy. 36 people - including 10 Taliban gunmen - were killed in an attack at the airport earlier this week.
All flights in and out of Karachi airport have been suspended, a Pakistani official has told Reuters.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.