The video board shows a tribute to Charlie Kirk at State Farm Stadium on September 14 in Glendale, Arizona. Chris Coduto/Getty Images

President Donald Trump, high-level administration and Republican Party officials, and top political influencers are expected to converge in Arizona on Sunday to honor Charlie Kirk, the assassinated conservative activist .

But the memorial service, to be held at the massive State Farm Stadium in Glendale, just outside Phoenix, is going to pose an enormous test for law enforcement, particularly the US Secret Service, an agency already facing strain and enormous pressure.

And the reason for the gathering — a single, fatal bullet intended to silence a political figure — only underscores the risks.

It remains to be seen whether the memorial will be desi

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