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Trump first mentions the idea of building a wall on the southern border and claims that Mexico will pay for it.
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Trump becomes the President of the United States.
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The President of Mexico cancels his trip to the White House and tells Trump that they are not paying for the wall.
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Many Congressional Republicans are expressing skepticism if the wall is worth the price tag.
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Leaked report from Department of Homeland Security estimates the cost of the wall at $21 billion.
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House speaker Paul Ryan toured the southern border and met with CBP officers.
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Customs and Border Protection announce they will be seeking proposals to design and build prototype wall structures.