Rep. Diane Black has introduced a bill to defund Planned Parenthood.
The California Democrat also weighed in a candid remark from Speaker John Boehner.
But a vote hasn't yet been officially scheduled.
The New York Democrat wants to look into potential errors in background checks.
It's not the first time Democrats have used the internet emoticon.
Sanders calls GOP legislation "an attack on women's health."
Carson didn't attack any of his GOP presidential rivals during the breakfast.
The Senate is also expected to take up a short-term bill this week.
The Republican leader said the Senate could take up the bill next week.
The House is expected to leave Washington Wednesday for the August recess.