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US President Donald Trump addresses a Republican retreat in Philadelphia on January 26, 2017.
US President Donald Trump said Thursday that talks with his Mexican counterpart Enrique Pena Nieto -- now called off -- would have been "fruitless" if Mexico is unwilling to pay for a wall along the countries' common border. / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump addresses a Republican retreat in Philadelphia on January 26, 2017.
US President Donald Trump said Thursday that talks with his Mexican counterpart Enrique Pena Nieto -- now called off -- would have been "fruitless" if Mexico is unwilling to pay for a wall along the countries' common border. / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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    President Trump's entire GOP retreat speech

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President Trump's entire GOP retreat speech

President Donald Trump spoke to republican lawmakers at a GOP retreat in Philadelphia.

President Trump's entire GOP retreat speech

President Donald Trump spoke to republican lawmakers at a GOP retreat in Philadelphia.