"It was unfortunate that a senior leader like Brar had broken the party discipline and criticised the party leadership," the Amritsar MP told reporters outside the SDM's office here.
He was accompanying his wife and Congress candidate Preneet Kaur for filing her nomination papers from Patiala Urban Assembly segment for the bypolls.
The former Punjab Chief Minister said it was wrong to single out Rahul Gandhi for the party's debacle in the last general elections.
He said there were multiple factors for the party's debacle.
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"Senior leaders like Brar are not expected to behave like the leaders of Opposition," he remarked, while adding, "It was outrightly absurd to seek Rahul Gandhi's resignation."
State Congress president Pratap Singh Bajwa today issued show cause notice to Brar seeking explanation for his conduct by August 5.
As former Union minister Natwar Singh's autobiography continued to raise a political storm, Amarinder Singh while replying to a question, said it was not proper for anyone in going public with private information that was shared with him in confidence.
A total of 10 candidates from Patiala and nine candidates from Talwandi Sabo Assembly constituencies have filed their papers till the last day of nominations to the bypolls for the two seats, scheduled for August 21.
Before filing the nomination papers she met about 35 MLAs, ex-MLAs and other senior party leaders who had come to greet her before going to submit her nomination papers.