Your professors want you to cite you articles using APSA (American Political Science Review) style.
For newspaper article, this will look like the following:
Author Last Name, Author's First Name. Year of publication. "Title of Article." Title of Newspaper, day month.
Example: Cuff, Daniel F. 1985. "Forging a New Shape for Steel." New York Times, 26 May.
Filters to Select from the left menu:
Source Type: Newspapers
Publication Date: January 1, 2017 - Today's Date - Using this date range will help you select articles that reflect this administrations conversations.
Document Type: Clicking on More will let you Include News, Article, and Feature and allow you to Exclude other types of content -- see if this helps!
Publication Title: Select the five papers that you are allowed to use: Washington Post, Wall Street Journal, LA Times, New York Times, and the Chicago Tribune (online versions are fine!)
Your professors have approved the following news outlets as credible (trustworthy) sources: