From The New York Times:
http://www.nytimes.com/2016/11/27/us/politics/trump-adviser-steps-up-searing-attack-on-romney.html
And this, from Glenn Kessler's "Fact Checker" column in The Washington Post:
https://www.washingtonpost.com/news/fact-checker/wp/2016/11/27/trumps-bogus-claim-that-millions-of-people-voted-illegally-for-hillary-clinton/