In 2002, he was one of over 46,000 Canadians awarded the Queen’s Golden Jubilee Medal for service to Canada.
In 2005, Grewal emerged at the centre of numerous political controversies that eventually gained significant national and some international attention. On November 29 2005, Conservative Party leader Stephen Harper announced in an interview that Grewal would not be a candidate in the 2006 federal election.
In the 1996 British Columbia provincial election, Grewal was the Reform BC candidate in the riding of Delta North. He won 769 votes, or 4% of the popular vote.
In 1997, he was made the Reform Party of Canada nominee in the federal riding of Surrey Central, and was elected in the 1997 federal election with 17,438 votes, or 35% of the popular vote.
In these negotiations Grewal offered to change parties in exchange for a senate seat for his wife, a cabinet post for himself, and an apology from Joe Volpe. In response, Murphy and Dosanjh made vague promises of future reward. While these negotiations were going on, prominent Conservative MP Belinda Stronach defected to the Liberals and did receive a ministerial position in the government. In the end, Grewal did not change parties.
Unbeknownst to his interlocutors, Grewal was recording the conversations, a fact that he revealed to the public on the evening of May 18, where Grewal publicly accused the Liberals of trying to buy his vote with offers of a cabinet or a diplomatic post for himself and a senate seat for his wife. The next day he claimed that he had made four hours of recording, and released nine minutes of a recording of a conversation with Murphy, in which Murphy suggests that he abstain from the coming confidence vote. New Democratic Party MP Yvon Godin referred them to Bernard Shapiro, Parliamentary Ethics Commissioner and to the Royal Canadian Mounted Police (RCMP).
Two weeks later, on May 31, Grewal handed over recordings to Shapiro and the RCMP. Simultaneously he released an hour and 15 minutes of recordings and transcripts to the public.
Several news outlets almost immediately began pointing to portions of the tape that seemed to be edited, something that Grewal and the Conservatives denied. Late on June 2, 2005, the Conservatives issued a news release (dubbed 'a suicide note' by the staffer who distributed it to reporters) admitting that two short sections had been accidentally omitted in the Punjabi portion of Grewal's conversation with Dosanjh on the morning of May 17. They simultaneously released a new recording that was 15 minutes longer than the one issued on May 31; on June 5 a new transcript was released.
As this was happening, audio experts began identifying clear edits in the May 31 tapes. Whether there are also edits in the June 2nd versions remains controversial.
Sometime in mid- to late June, Grewal handed more copies of the recordings over to the RCMP, though he subsequently explained that these were his own personal copies of already existing recordings.
In mid-August, the RCMP announced that there would be no further criminal investigation into the tapes and their contents.
In January 2006, a few days after the general election, Parliamentary Ethics Commissioner Bernard Shapiro released a report
that was sharply critical of Grewal. Grewal, he found, had sought an inducement either for his personal gain or in order to entrap the Liberals.
Some criticized the stress leave, either for the fact that Grewal would continue to receive pay, or for the example he was setting by taking a stress leave without, as far as the public knew, seeking professional attention for this stress.
His former business parter Gurwinder Dhillon claimed in a Globe and Mail article that Grewal purchased these shares as a means to fulfil his obligation as an investor immigrant when he moved to Canada from Liberia.
Grewal and his wife Nina moved from Liberia in 1991, and both their children were born there.
Jim Holt, the president of the Conservative riding association for Newton-North Delta, claimed that the story was part of a "political assassination campaign" by the Liberals against Grewal.
Report of Ethics Commissioner Bernard Shapiro