It is because Cartoon-e-Azam PM Imran Khan is still awaiting a phone call from President Biden.
No Pakistani Prime Minister has ever been insulted and humiliated by a US President like Cartoon-e-Azam PM Imran Khan has been so far.
First, President Trump offered him mediation on Kashmir, while at the same time gave Modi the green light to annex Indian Occupied Kashmir altogether.
Second, President Biden doesn't even care whether Cartoon-e-Azam PM Imran Khan is a leader of a nuclear power. That is his auqaat.