04/10/2019 13:14 EDT | Updated 04/10/2019 14:54 EDT

Rob Nicholson, Former Conservative Cabinet Minister, Won't Run In 2019 Election

He's spent 24 years as a member of Parliament.

Adrian Wyld/CP
Minister of Justice Rob Nicholson responds to a question during Question Period in the House of Commons in Ottawa, Wednesday May 9, 2012.

OTTAWA — Rob Nicholson, the longest-serving Conservative member of Parliament, isn't running for re-election in the fall.

Nicholson, who was first elected in 1984 in Niagara Falls and held cabinet posts for more than a decade, says it's time for him to focus on his family.

The 66-year-old has spent 24 years as an MP under three Conservative prime ministers, beginning in the government of Brian Mulroney.

Nicholson won his riding six times, first in 1984 and again in 1988, 2004, 2008, 2011 and 2015, with a stint in local politics in the 1990s.

Watch: Trudeau, Scheer look ahead to 2019 election. Story continues below.

From 2006 until 2015, he was appointed by then prime minister Stephen Harper to several cabinet portfolios, including justice, defence and foreign affairs.

But Nicholson says one of his most memorable positions was that of parliamentary secretary to the justice minister earlier in his career, when he helped pass legislation making it illegal to possess child pornography.

"It was something that I believed was the right thing to do and it was in line with what was taking place in the world," the married father of three told reporters Wednesday as he entered the weekly Conservative caucus meeting in Ottawa.

"I believe it was the last piece of legislation of the Mulroney government, but I never forget how proud I was."

More from HuffPost Canada:

Nicholson was appointed in January to the National Security and Intelligence Committee of Parliamentarians, which serves as a high-level review body for the country's security and intelligence agencies.

While he hasn't said what he will do after departing federal politics, Nicholson said he will do what he can to ensure Conservative Leader Andrew Scheer is elected in October to govern the country.