Tariq Anwar was a Lok Sabha member from Katihar in Bihar.
NCP national general secretary Tariq Anwar Friday said he had resigned from the party and Parliament following party chief Sharad Pawar's "defence" of Prime Minister Narendra Modi on the Rafale deal.
Making the announcement in his Lok Sabha constituency here, Mr Anwar said he was resigning from all posts in the party, of which he was a founding member, and also giving up his membership of Parliament.
Mr Anwar told reporters he was "hurt" by Mr Pawar's interview to a Marathi news channel this week where he said Prime Minister Narendra Modi's intentions on the Rafale fighter jet aircraft deal were not wrong.
The party later came out with a clarification, saying it did not amount to a clean chit to the prime minister.
Mr Anwar, a former union minister, has been backing the Congress demand for a JPC probe into the deal and has also sought a white paper on the issue.
"No decision has been taken so far about my future political move. I will be deciding that after consulting my supporters," he said.
Reacting to the development, Congress MLC Prem Chand Mishra described Mr Anwar as a "fine leader".
"We shall be eagerly looking at his next political move," he said.