Trump may soon find himself battling 5 Republicans for re-election -- they could help Democrats win the White House - Raw Story

A same-party primary challenge against a sitting president is not unheard of. Five members of a sitting president's party would be extraordinary. Currently, only former Massachusetts governor Bill Weld has officially declared he is running for the Republican nomination for president. ....
https://www.thenewcivilrightsmovement.com/2019/08/trump-may-soon-find-himself-battling-5-republicans-for-re-election-they-could-help-democrats-win-the-white-house/

Former Republican congressman warns Trump a 'storm' is coming - CNN Politics

Former South Carolina Republican Rep. Mark Sanford, who is considering mounting a challenge to President Donald Trump in 2020, warns of a looming financial crisis for America if the country doesn't try tackling its mounting debt.....
https://www.cnn.com/2019/08/14/politics/mark-sanford-trump-2020-campaign/index.html

A Republican Congressman Just Destroyed Trump's 'Lie' Of A Budget

Citing the Bible and expressing his sympathies in advance, Republican South Carolina Rep. Mark Sanford savaged President Donald Trump's budget proposal Wednesday as a "myth" and a "lie," hammering the White House's spending plan more thoroughly than any Democrat. ...
http://www.huffingtonpost.com/entry/mark-sanford-trump-budget_us_5925b607e4b00c8df2a10b40?ncid=APPLENEWS00001