Pakistan's former Prime Minister Imran Khan, who is currently facing arrest warrants in several cases, rallied thousands of supporters in Lahore Monday.

Since his ouster last April in a no-confidence vote in Parliament, Khan has routinely ignored arrest warrants and court summons in a string of cases against him, claiming they are a plot by the government of his successor, Prime Minister Shahbaz Sharif, to discredit his campaign.

The former cricket star turned politician has claimed that his ouster was illegal and a conspiracy by Sharif and Washington, which have denied the allegations.

Khan's critics say his flaunting of the courts is a maneuver to delay his trials on allegations of terrorism, contempt of court and graft.

One of the warrants issued Monday was over charges that Khan sold state gifts and concealed assets while in office, the other was in connection with his verbal threats against a judge during a rally last year.

The warrants request that Khan be brought to court for hearings scheduled on March 18 and March 29. However, it remained unclear whether the police would act on them.

The developments indicate Sharif's government is stepping up pressure on Khan, who is currently campaigning for his party in upcoming elections for two regional assemblies. Monday's rally was taking place in the eastern city of Lahore, where Khan lives now.

"Imran Khan is deliberately failing to appear before the courts," said Mohsin Ranjha, a lawyer for Sharif's ruling Pakistan Muslim League party.

Pakistan Tehreek-e-Insaf opposition party said authorities have registered 80 "fake cases" against Khan in order to politically victimize the former premier, whose life is being threatened. Fawad Chaudhry, a senior party leader, said Khan's legal team would challenge the warrants.

Khan's supporters threw rose petals at a convoy carrying him to the Lahore rally, which swelled to over 5,000. Security was ramped up and hundreds of police were deployed to the city for Monday's rally, which authorities permitted.

Last Wednesday, police used water cannons and fired tear gas to disperse Khan's supporters during a banned rally in Lahore. Dozens of his followers were arrested for defying the ban.

Khan was attacked during a rally in November when a gunman shot him in the leg. One of Khan’s supporters was killed and a dozen others were wounded in the attack, which drew nationwide condemnation.