Kejriwal's attack on Jung came after a letter written by the LG to the Prime Minister's Principal Secretary Nripendra Mishra in February on working of a bureaucrat in the office of Delhi's Home Minister found its way to media.
In the letter, Jung had said that an officer, S K Nagarwal, belonging to Indian Railway Service of Engineers (IRSE), was found working with Delhi's Home Minister while on study leave from the Railways.
Rejecting LG's report, a Delhi government spokesperson said Nagarwal never worked with city administration as he was not released by the Railways.
"Shocking! LG snooping on CM and Ministers. Who visits CM and ministers- LG secretly collecting this info and informing PMO," the Delhi Chief Minister tweeted.
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A senior official in the Lt Governor's secretariat termed Kejriwal's allegation as "baseless", saying that it had received a written complaint stating that Nagarwal was working in the Delhi government when he was on study-leave from Railways.
The Delhi government is also furious over a directive by the Union Home Ministry which had asked it to furnish details of all officers on deputation to Delhi administration. The MHA, in its letter dated May 24, even asked the city government to provide details of all consultants appointed by the AAP dispensation.
In reply to the Home Ministry directive, Kejriwal today wrote a letter to Union Home Minister Rajnath Singh refusing to provide the details as sought by his ministry.
In a separate release, the Aam Aadmi Party alleged the LG's act "undermined" the basic functioning of the elected government.
"It is a matter of extreme seriousness that the Lt Governor of Delhi is spying on the ministers of the elected government of the National capital Territory of Delhi.
"Since the letter has been addressed to the PMO, it is clear that under directions from the very top in the central government, the Delhi LG Najeeb Jung is illegally interfering in the functioning of the elected government.
"This letter raises extremely serious questions about the kind of undesirable activities in which the Delhi LG appears to be indulging," the party alleged.
"Under whose directions is the LG seeking information about the visitors to ministers of the Delhi government? Why is the LG interested in knowing about the work being done in the offices of ministers?" the party asked.
It also asked whether such instructions were being given to all governors/ LGs across India by the PMO or was it restricted only to Delhi.