The most expensive political ad campaign of the year is being run by the Department of Homeland Security.

Why it matters: DHS disputes that its ads are political. But it has spent at least $51 million this year on ads thanking President Trump for securing the border, according to AdImpact. • The next closest ad campaign is the $41 million effort to support California's redistricting measure, according to AdImpact. • The DHS ads promote Trump's mass deportation agenda in a series of direct-to-camera videos starring the face of the policy, Secretary Kristi Noem. • They're part of a $200 million fast-tracked contract pushing self-deportation.

Zoom in: "[T]his isn't a political ad—this is a public service announcement urging illegal aliens to leave," Assistant Secretary Tricia McLaughl

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