Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) quipped Monday that the U.S. is involved in so many conflicts that Sen. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) can't keep track of all of them.

"You know you are in too many wars in too many places when even warmonger Lindsay Graham can’t keep track anymore," Paul tweeted.

You know you are in too many wars in too many places when even warmonger Lindsay Graham can’t keep track anymore — Senator Rand Paul (@RandPaul) October 23, 2017

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Graham said on Sunday he wasn't aware the U.S. had 1,000 troops in Niger.

"I didn't know there was 1,000 troops in Niger," Graham said on NBC's "Meet The Press."

Officials say four U.S. soldiers were killed in Niger in an ambush orchestrated by the Islamic State in the Greater Sahara, a terrorist group linked to the Islamic State in Iraq and Syria.