Montreal mourns victims of the deadly attack as investigators reveal new details and police warn about copycat threats; A Canadian-led study is challenging traditional breast cancer care, finding some patients may benefit from less intensive treatment; U.S. Ambassador Pete Hoekstra discussed Canadians returning to the U.S. and weighed in on relations between Ottawa and Washington. 

<p>Montreal mourns victims of the deadly attack as investigators reveal new details and police warn about copycat threats;&nbsp;A Canadian-led study is challenging traditional breast cancer care, finding some patients may benefit from less intensive treatment;&nbsp;U.S. Ambassador Pete Hoekstra discussed Canadians returning to the U.S. and weighed in on relations between Ottawa and Washington.&nbsp;</p>

CTV National News is Canada's most-watched national news program. Now you can stay up to date Monday to Sunday with the CTV National News Podcast, delivered nightly. Listen to Canada’s most trusted newscast featuring stories from here and around the world with a perspective that is distinctly Canadian and backed by the #1 news organization in Canada.

<p>CTV National News is Canada's most-watched national news program. Now you can stay up to date Monday to Sunday with the CTV National News Podcast, delivered nightly. Listen to Canada&rsquo;s most trusted newscast featuring stories from here and around the world with a perspective that is distinctly Canadian and backed by the #1 news organization in Canada.</p>