You can impeach him but your not going to get the 67 votes necessary in the the Senate to convict him, so why bother? Obama wants to be impeached, the Democrats and the MSM would love it. It would create a distraction from the economy and they desperately want that.
Loyalty to the sacred oath of office to support the Constitution of the United States.
It's hardly trivial.
The U.S. ConstitutionFourteenth Amendment
Section 3
"No person shall be a Senator or Representative in Congress, or elector of President and Vice-President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof..."