The federal Conservatives have shifted their focus from targeting the ruling liberals to attacking the new Democratic Party in a new offensive ad.

The new ad – set to be released this afternoon, Tuesday – describes new Democratic Party leader Jagmeet Singh as "Singh the traitor," and features in a fake magazine titled "Luxury Retiree Monthly," using real headlines throughout his leadership.

The 30-second ad, narrated by a woman with dramatic music in the background, begins, "Jagmeet Singh is used to getting what he wants." "He went to an expensive American private school in Beverly Hills, has Rolex watches, BMW cars, Versace bags, but now he has a problem."

The ad continues, "He needs to postpone the elections until next year, when he qualifies for his $2 million pension, so he sold you out and signed with (Prime Minister Justin) Trudeau to raise taxes, crime, and housing costs."

The ad concludes: "Singh has sold himself; he's getting his pension, and you are paying the price."

After the shocking defeat the liberals suffered in the by-election to the conservatives in Toronto–St. Paul's in June – in a district that has long been considered a party stronghold – pollsters and political observers say it is clear that there are no safe seats.

Meanwhile, other upcoming by-elections – in Elmwood–Transcona in Winnipeg and LaSalle–Émard–Verdun in Montreal – have also attracted the leaders' attention, as both Conservative leader Pierre Poilievre and Singh campaigned for their respective candidates this week.

Poilievre held a rally in Winnipeg on Sunday, while Singh was in Montreal on Monday.

The by-elections are scheduled for September 16.

It is noteworthy that the new Democratic Party released its own offensive ad last month, marking the party's largest pre-election ad spend since 2015.

This 30-second ad features Singh preparing for what the party calls a "rule-changing tour," aimed at conservatives and liberals.

Kathleen Monk, the former strategist for the new Democratic Party and communications director for the late Jack Layton, noted the importance of the upcoming by-elections in an interview with CTV News, stating that voters need to "follow the money in campaigns."

She said it is important for conservatives to focus on the new Democratic Party now, after years of targeting liberals, who have consistently lagged in polls.

Monk stated, "It's a very strong ad, and this is the first time we've seen conservatives dedicating large amounts of money to an ad targeting the new Democrats,” adding, “And if you’re asking yourself why this is, it’s because they see the new Democrats as a real threat in the upcoming elections."

She also described the conservative ad as "unfair" and a "personal attack."

Monk added that she does not believe the ad "will resonate with Canadians," given Singh's record in pushing for dental care and pharmacare through the confidence-and-supply deal that the new Democratic Party struck with the liberals.

Corey Tinike, who was the campaign manager for Ontario Premier Doug Ford and former communications director for then-Prime Minister Stephen Harper, described the conservative ad as "devastating" and "very effective" during an interview with CTV News.

He said, "If you look at some of the people who are leaving the new Democratic Party to join the conservative parties, whether provincial or federal, it’s often around these kinds of issues," adding, "Traditional supporters who might be a bit more connected to the workers in their jobs or, you know, private sector union members, are not really the Rolex and Gucci shoe crowd."

He added that the new Democratic Party under Singh "has really lost the plot when it comes to speaking to those voters," and it is wise for the conservatives to exploit this disconnect and portray the new Democratic Party leader as out of touch with his party's base.

The conservatives are set to release a second offensive ad on Wednesday.