On Sunday, the United States summarily executed six al-Qaeda
operatives in Yemen. Some foreign newspapers and officials of some
other countries have criticized this action as being immoral and
violative of international law, and the U.S. has criticized similar
actions when taken by other countries, particuarly Israel.

My question is this:  Have there been any members of the U.S. Congress
who have publicly made similar criticisms of the U.S. action?

If you can answer that, I'll give you extra credit for this: Have
there been any major American newspapers (in their editorials, not
merely in columns written by a single writer) that have criticized the
executions as immoral or in violation of international law?

(Note: I am most interested in members of Congress, and that's the
answer I'm paying for.  But it's worth at least an extra star if you
can find a major newspaper's editorial that takes this position.)

I did some research, and the answer to your question appears to be
short:

"no". No, there does not appear to be any members of Congress or major
media outlets (or even very many minor ones) that have made a stand
against the recent US action in Yemen.

Since I could not find a positive answer for you, and a negative is
difficult to prove, I refrained from posting this as an answer.
Perhaps someone else will find a member of Congress that said
something critical of the US action in Yemen.