Pakistan must detach itself from the United States and exit the so-called war on terror to achieve prosperity, opposition leader Imran Khan says.

Pakistan's parliament will meet on Tuesday to elect a new prime minister after the Supreme Court disqualified Nawaz Sharif following an investigation into corruption allegations against his family.

The Supreme Court concluded its hearings into allegations of corruption against Sharif and his family on Friday.

Pakistan opposition leader Imran Khan strongly denounces anti-Iran remarks by US President Donald Trump in Saudi Arabia.

Pakistani opposition leader Imran Khan and thousands of his supporters have held a rally in the capital Islamabad.

An analyst says Imran Khan’s threat to shut down Islamabad was basically meant to pressure the Supreme Court to listen to public demands.

"I am so happy that the Supreme Court has decided that from Thursday it will begin probing Nawaz Sharif," Khan said.

Opposition members in Pakistan said expired tear gas fired by police killed the two protesters.

The number of those arrested overnight during a nation-wide crackdown against PTI supporters ranges between 1,500 and 1,800.

The Islamabad High Court (IHC) announced on Monday that it gave the Pakistan Tehreek-i-Insaf (PTI) Party permission to hold the sit-in on Wednesday.