Tracking legal challenges to Trump's emergency declaration

4 lawsuits have been filed since Friday

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President Donald Trump speaks on border security during a Rose Garden event at the White House on Feb. 15, 2019 in Washington, D.C.

(CNN) - As President Donald Trump moves forward with plans to build additional physical barriers along the southern border, his administration will have to contend with a slew of lawsuits challenging the national emergency declaration allowing him, in part, to do so.

So far, at least five lawsuits have been filed challenging the declaration. The argument at the core of each lawsuit is similar: Trump exceeded his authority and circumvented Congress in an attempt to achieve his signature campaign promise for an emergency that, plaintiffs argue, doesn't exist.

Here's a rundown of the lawsuits:

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