Arnie Seipel

There's a lot to watch for in Tuesday's Democratic presidential debate in Ohio.

When Labor Secretary Alex Acosta steps down on July 19, his deputy Patrick Pizzella will step in as acting head of the department.

The acting secretary will have some company.

The Defense Department is currently led by acting Secretary Mark Esper, who is expected to be confirmed in the coming weeks.

Updated at 11:17 p.m. ET

Secretary of Homeland Security Kirstjen Nielsen is leaving her post, President Trump announced Sunday as he continues to focus on restricting border crossings amid a recent surge. Nielsen had recently warned a congressional panel of a "catastrophe" on the southern border after the number of crossings hit a 10-year high.

Updated at 7:18 a.m. ET

Ohio Democratic Sen. Sherrod Brown took a step towards a 2020 presidential campaign, announcing a tour of states holding early presidential primaries next year.

Seeking to counter President Trump's appeal to white, working-class voters that helped him flip Ohio and other key midwestern states, Brown is launching a "Dignity of Work" tour through Iowa, New Hampshire, Nevada and South Carolina.

The partial government shutdown is now the longest in history, as Saturday marks Day 22. The previous record was 21 days, set in the winter of 1995-96 when President Bill Clinton and House Speaker Newt Gingrich were at odds over budget cuts.

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