Changes

*Samuels, Brett (May 18, 2019). [https://thehill.com/homenews/administration/444165-trump-blasts-de-blasio-from-air-force-one-while-en-route-to-nyc Trump blasts de Blasio from Air Force One while en route to NYC]. ''The Hill''. Retrieved May 18, 2019.

*Samuels, Brett (May 18, 2019). [https://thehill.com/homenews/administration/444165-trump-blasts-de-blasio-from-air-force-one-while-en-route-to-nyc Trump blasts de Blasio from Air Force One while en route to NYC]. ''The Hill''. Retrieved May 18, 2019.

*Gage, John (May 16, 2019). [https://www.washingtonexaminer.com/news/trump-rips-bill-de-blasio-in-air-force-one-video-vote-for-him-if-you-like-crime Trump rips Bill de Blasio in Air Force One video: Vote for him ‘if you like crime’]. ''Washington Examiner''. Retrieved May 18, 2019.</ref> He also adopted effective tactics – which had once been used exclusively by the Left – to benefit conservatism and his campaign.<ref>Miele, Frank (May 13, 2019). [https://www.realclearpolitics.com/articles/2019/05/13/trumps_rules_for_republicans_adapted_from_alinsky_140308.html Trump's Rules for Republicans (Adapted From Alinsky)]. ''RealClearPolitics''. Retrieved May 17, 2019.<br>See also:

*Gage, John (May 16, 2019). [https://www.washingtonexaminer.com/news/trump-rips-bill-de-blasio-in-air-force-one-video-vote-for-him-if-you-like-crime Trump rips Bill de Blasio in Air Force One video: Vote for him ‘if you like crime’]. ''Washington Examiner''. Retrieved May 18, 2019.</ref> He also adopted effective tactics – which had once been used exclusively by the Left – to benefit conservatism and his campaign.<ref>Miele, Frank (May 13, 2019). [https://www.realclearpolitics.com/articles/2019/05/13/trumps_rules_for_republicans_adapted_from_alinsky_140308.html Trump's Rules for Republicans (Adapted From Alinsky)]. ''RealClearPolitics''. Retrieved May 17, 2019.<br>See also:

*Boyle, Matthew (July 12, 2019). [https://www.breitbart.com/politics/2019/07/12/donald-trump-attempt-revolutionize-gop-fundraising-consultant-class-pushes-back/ Exclusive: Donald Trump Attempts to Revolutionize GOP Fundraising; Consultant Class Pushes Back]. ''Breitbart News''. Retrieved July 12, 2019.</ref> Trump officially announced his 2020 campaign on June 18, 2019.<ref>Multiple references:

*Boyle, Matthew (July 12, 2019). [https://www.breitbart.com/politics/2019/07/12/donald-trump-attempt-revolutionize-gop-fundraising-consultant-class-pushes-back/ Exclusive: Donald Trump Attempts to Revolutionize GOP Fundraising; Consultant Class Pushes Back]. ''Breitbart News''. Retrieved July 12, 2019.

*Rogers, Katie (September 13, 2019). [https://www.nytimes.com/2019/09/13/us/politics/donald-trump-2020-campaign.html With Markers and Straws, Trump’s Campaign Sells Defiance as a Lifestyle]. ''The New York Times''. Retrieved September 13, 2019.</ref> Trump officially announced his 2020 campaign on June 18, 2019.<ref>Multiple references:

*Byas, Steve (June 19, 2019). [https://www.thenewamerican.com/usnews/politics/item/32637-trump-kicks-off-re-election-bid-keep-america-great Trump Kicks Off Reelection Bid: “Keep America Great”]. ''The New American''. Retrieved June 19, 2019.

*Byas, Steve (June 19, 2019). [https://www.thenewamerican.com/usnews/politics/item/32637-trump-kicks-off-re-election-bid-keep-america-great Trump Kicks Off Reelection Bid: “Keep America Great”]. ''The New American''. Retrieved June 19, 2019.

*Howell, Tom; Boyer, Dave (June 18, 2019). [https://www.washingtontimes.com/news/2019/jun/18/donald-trump-vows-keep-america-great-2020-launch-w/ Trump vows to 'Keep America Great' in 2020 launch: 'We're going to finish the job']. ''The Washington Times''. Retrieved June 19, 2019.

*Howell, Tom; Boyer, Dave (June 18, 2019). [https://www.washingtontimes.com/news/2019/jun/18/donald-trump-vows-keep-america-great-2020-launch-w/ Trump vows to 'Keep America Great' in 2020 launch: 'We're going to finish the job']. ''The Washington Times''. Retrieved June 19, 2019.