Canadian Ambassador to the United States David MacNaughton said he鈥檚 鈥渆cstatic鈥 that the White House lifted its tariffs on Canadian steel and aluminum, and he expects the new NAFTA agreement to become official this summer.

In an interview with CTV鈥檚 Question Period, MacNaughton said he expects U.S. Congress to pass the renegotiated USMCA deal (or CUSMA, as it鈥檚 known in Canada) by the end of July, when the summer sessions wraps up.

鈥淚鈥檝e spent a lot of time on the Hill talking to people, including a lot of Democrats, and I think this tariff resolution is going to give the impetus to get this deal done. And I am extraordinarily pleased that this has happened,鈥 MacNaughton said in an interview that airs Sunday.

The ambassador was one of several key members of what he called 鈥渢eam Canada鈥: a group of top cabinet ministers, public servants and industry stakeholders lobbying U.S. officials to eliminate the tariffs, which were put in place one year ago during NAFTA talks.

鈥淲e were just determined and persistent and unwavering and 鈥 as in the NAFTA negotiations, it was team Canada at its best.鈥

U.S. President Donald Trump campaigned in 2016 on a platform that included killing NAFTA and replacing it with a 鈥渂etter鈥 deal for Americans. But Canada鈥檚 NAFTA negotiators, including Foreign Affairs Minister Chrystia Freeland, said they refused to sign any deal that wasn鈥檛 mutually beneficial.

Ottawa responded to the U.S. tariffs last May with $16.6-billion worth of countermeasures against a long list of American imports, including products such as bourbon, boats and pens.

The year-long stalemate wasn鈥檛 broken on a single issue, MacNaughton said. Rather, he said that he and other Canadians repeatedly told U.S. officials that Parliament simply could not pass the new deal with trade barriers in place.

鈥淎nd I don鈥檛 think they believed me, but I honestly believed it. I didn鈥檛 think the government or Parliament would pass the legislation as long as this was around.鈥

MacNaughton also cited key support from influential Republicans, including Iowa Senator Chuck Grassley and Kansas Senator Pat Roberts, who opposed the tariffs.

鈥淲e had people on both sides of the floor saying, 鈥榊ou need to get these things out of the way.鈥欌

The Trump administration鈥檚 decision to drop the tariffs marks a significant win for the federal government. On Friday, Prime Minister Justin Trudeau called the news a "good day for steel and aluminum workers right across the country."

Hours after the announcement, U.S. Vice-President Mike Pence said he was coming to Ottawa on May 30 to sit down with Trudeau to move forward with the USMCA deal 鈥渁s swiftly as possible.鈥 Pence described the deal as

Sources have told CTV News that the U.S. and Mexico have also reached a similar agreement.

From MacNaughton鈥檚 point of view, the White House鈥檚 decision to scrap the tariffs proves that persistence pays off.

鈥淲e鈥檙e only 35 million people. But when we work together, there鈥檚 almost nothing we can鈥檛 do,鈥 he said. 鈥淚 say to the Americans: we鈥檙e really nice people, we鈥檙e really fair people and we鈥檙e really reasonable people. But we鈥檙e also hockey players, so.鈥

Asked if he鈥檚 concerned that Andrew Scheer鈥檚 Conservatives could change the deal if they win the election this fall, MacNaughton refused to comment.

鈥淎s a non-partisan public servant, I don鈥檛 think it鈥檚 appropriate for me to comment on Canadian politics.鈥

As for when Canada will approve the deal, MacNaughton said he expects the federal Liberal government to introduce its own legislation 鈥渧ery, very shortly.鈥