During a meeting of the House Republican Conference the same day the Supreme Court handed down rulings on two same-sex marriage cases, Amash urged his colleagues not to say anything intensely negative about same-sex marriage that could be construed as hateful, multiple Republicans in the room confirmed to The Hill.

Amash was moved to stand up and urge his colleagues after House Majority Leader Eric CantorEric Ivan CantorBottom line Virginia GOP candidates for governor gear up for convention Cantor: 'Level of craziness' in Washington has increased 'on both sides' MORE (R-Va.) urged Republicans at the meeting to be "judicious" with their responses to the Supreme Court's rulings on a case examining the constitutionality of the Defense of Marriage Act (DOMA) and a separate case examining the constitutionality of California's Proposition 8, which is a ban on same-sex marriage.

In his warning, Amash argued that some younger Republicans support same-sex marriage and that negative comments in response to the rulings could anger those younger Republicans.

Amash seemed to reiterate his argument on his Facebook on Wednesday as well, writing that "marriage is a private institution that government should not define."

"To me and millions of Americans, marriage is also a religious sacrament that needs no government approval," Amash wrote. "As a conservative, I will continue to push for less government interference in our personal and economic affairs."

The Supreme Court on Wednesday overturned a part of DOMA barring same-sex couples from receiving federal benefits. The decision for that case was 5-4 in favor of overturning it. The high court also ruled 5-4 to dismiss a challenge to California's Proposition 8.