The Dawn reported that Khan has stopped giving his weekly press briefing and also has vanished from TV screens.
Khan was not even seen on channels on the night of Karachi airport attack. He has also stopped accompanying Sharif when he attends parliament session and also been missing the parliamentary activities.
He even did not turn up on the day the budget was presented in the National Assembly.
One of the two PML-N leaders, who spoke on the condition of anonymity, explained how Sharif's cagey way of working had put off many of the party's key leaders including Khan.
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The discontentment has worsened with the budget session as the senior leadership had not been provided any information beforehand of the budget.
Khan and many others within the party are not happy that finance minister Ishaq Dar, a relative of Sharif, had not sought their suggestions or shared any information with them about the 2014-15 budget.
Khan went so far as to say that the issue was allowed to linger on, making the government look indecisive. These concerns had been voiced in front of a few party members.
There are reports that Khan was not happy the way talks with Taliban were announced, as Sharif had agreed to launch military operation against the Taliban in January but made last minute changes in the speech and appointed a four-member committee for talks.