Union Minister Nirmala Sitharaman also hit out at the Congress high command for "looking the other way" in cases of corruption involving its state leaders and said that it should now "speak out".
"Vigilance court has asked that an FIR be filed. It cannot be graver than this. BJP demands that the chief minister resign immediately. The CM has no locus standi to be in his chair.
She also referred to the resignation of the state's Finance Minister and Excise Minister over corruption charges and graft allegations being leveled against the Power Minister.
Asked about Chandy's defense, she shot back "I don't think he has a choice".
When the charges were first made against him, Congress leaders claimed that it was merely an allegation and not verified but the court's direction underlined their seriousness, she said.
"These are not light and frivolous allegations but very serious charges," Sitharaman said.
"One cannot hope much from the Congress high command because it has looked the other way on corruption. Congress moves from one issue to another (to target BJP) but will somebody from its high command go to Kerala and speak on corruption?" she said.
The reaction came after a vigilance court today ordered registration of an FIR against Chandy and Power Minister Arayadan Mohammed in connection with the solar scam.
Targeting Chandy and Mohammed, prime accused in the solar scam, Saritha S Nair had alleged that she had paid bribes totalling Rs 1.90 crore to a close aide of the chief minister while Rs 40 lakh had been given to the Power Minister.