McCaskill welcomes ninth grandson in a row
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Sen. Claire McCaskillClaire Conner McCaskillSenate moderates hunt for compromise on family separation bill Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral Hillicon Valley: Verizon, AT&T call off data partnerships after pressure | Tech speaks out against Trump family separation policy | T-Mobile, Sprint make case for B merger MORE’s family is beefing up in the testosterone department — the Missouri Democrat is welcoming her ninth grandson in a row.

The 64-year-old lawmaker tweeted Tuesday that her family was expanding with another male addition:

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A McCaskill spokesman tells ITK the newest addition is named Samuel Patrick, and he weighed in at 7 lbs., 11 oz. when he was born at a St. Louis hospital. Samuel is McCaskill's son and his wife's third son.

February has proven to be a productive month for the McCaskill clan. Earlier this month, McCaskill welcomed her 10th grandchild overall.

McCaskill, considered one of the most vulnerable Democratic senators heading into November’s midterm elections, is a mother of three adult children. Several of her grandkids are the children of her husband Joseph Shepard's kids. 

—Updated at 5:39 p.m.