"Elvis Gomes is known all over Goa for his honesty. (He is) being victimised by the BJP government," Kejriwal tweeted.
Kejriwal's remarks came after Gomes was summoned by the Anti-Corruption Branch (ACB) of the Goa Police for his alleged involvement in a housing scam.
"People of Goa will give a befitting reply to the BJP" in the state assembly elections next year, Kejriwal said, adding "Goa will vote for honesty".
Gomes, a former Inspector General of Prisons, was last week declared AAP's Chief Ministerial candidate in the state.
On Friday, Gomes along with Nilkanth Halarnkar, a former Minister of Goa for Housing in the erstwhile Congress-NCP alliance government, was summoned to report before the ACB on Monday.