WATCH: Dem rep’s tip on how to not get tricked by fake tweets

A Democratic lawmaker is advising his colleagues on how to not get suckered by fake Twitter accounts, which happened to some top Democrats on Tuesday.

Rep. Eric Swalwell’s (D-Calif.) tip: Look for the telltale blue check mark that denotes a verified account.

"Look for the check mark, make sure they're verified, step one," Swalwell, a member of the House Intelligence Committee, advised fellow lawmakers.

Earlier Tuesday, House Minority Leader Nancy Pelosi (D-Calif.) and House Oversight Committee ranking member Elijah Cummings (D-Md.) cited a fake Twitter account purporting to belong to former national security advisor Michael Flynn as they called for investigations into Flynn.

Flynn resigned late Monday after reports he misled top White House officials about the nature of his conversations with Russia’s U.S. ambassador in December.

Even though the Twitter account Pelosi and Cummings referenced ended up being phony, Swalwell joins the top Democrats in saying an investigation into Flynn is still warranted.

Watch the video above to hear Swalwell in his own words.