"The Revolutionary Committee is monitoring the suspicious movements of Abd Rabbuh Mansour Hadi, who lost legitimacy after his reckless actions harmed the Yemeni people," read a Houthi statement broadcast by Yemen's Houthi-controlled official news agency.
"Any government employee, including diplomatic staffers, who deal with or obey orders issued by [Hadi] will face legal penalties," the group declared.
Earlier Tuesday, Hadi deployed supporters and private guards around presidential palaces in Yemen's southern Aden province, a source close to the president said.
Hadi, who hopes to reinstate his embattled presidency from Aden, fears the influence of the powerful Houthi group – which now controls the government in Sanaa – on his new headquarters.
A senior official told AA that Hadi had sent a letter to parliament withdrawing his earlier resignation, which he submitted last month after the Houthis seized Sanaa's presidential palace and parliament.
Upon his arrival to Aden on Saturday, Hadi declared that all decisions taken by the Houthis since Sept. 21 of last year – when the Shiite group took control of Sanaa – were "null" and "illegitimate."
Hadi fled Sanaa to the southern city of Aden earlier this week, later declaring he was still Yemen's "legitimate" leader.
Since his arrival in Aden, Hadi has met with senior officials from Yemen's southern region.
Last month, Hadi tendered his resignation to parliament after the Houth group seized control of Sanaa's presidential compound amid clashes with presidential guards.
Since then, however, parliament has failed to convene to accept or reject the resignation.
Since it seized Sanaa last September, the Houthi group has sought to consolidate its control over other parts of the country as well.
On Feb. 6, the Houthis issued a "constitutional declaration" dissolving parliament and establishing a 551-member transitional council.
The declaration, however, was rejected by most of Yemen's political forces – along with some neighboring countries – which described it as a "coup against constitutional legitimacy."