He laid out the condition after claiming that Congress leader Patel approached him yesterday.
Notably, at least eight to 11 Congress MLAs, considered to be close to Vaghela, had cross-voted in the July 17 presidential poll in favour of NDA nominee Ram Nath Kovind.
"Ahmed Patel came to meet me last night. He said I should fight the Rajya Sabha election, which I refused. I assured him that I will vote for him in the election to the Rajya Sabha seat as I have not yet resigned as an MLA," said Vaghela.
"He (Gehlot) had alleged that I quit the Congress as I was being blackmailed with the threat of CBI and ED (probes). The CBI had, in the past, conducted raids at my house two or three times and I was also called for questioning at its Mumbai office," he said.
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The former Gujarat chief minister claimed that the central probe agency could not find anything against him and the case was closed, adding that there was no Enforcement Directorate (ED) case against him as well.
Gehlot had yesterday said it seemed that Vaghela quit the Congress due to some pressure or blackmailing by the BJP.
"Gehlot should take back his words and publicly apologise or else, I will not support Patel in the Rajya Sabha poll," said the Kshatriya strongman, who wields a considerable influence in north Gujarat.
Patel submitted his papers to Assembly Secretary D M Patel in the presence of Gujarat Congress president Bharatsinh Solanki and Gehlot.
State Nationalist Congress Party (NCP) chief Jayant Patel, one of the two MLAs of the party in Gujarat, and lone JD(U) MLA Chhotu Vasava were also present on the occasion.
The Rajya Sabha election is scheduled to be held in Gujarat on August 8.
Of the 11 Rajya Sabha members from the state, the term of three -- Smriti Irani and Dilipbhai Pandya (both BJP) and Patel (Congress) -- comes to an end on August 18.
The Congress is going through a turmoil after the sudden exit of Vaghela last week.
The veteran politician has quit as the Leader of Opposition in the Gujarat Assembly, but continues to be an MLA.
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