Why, thank you.
Opinions differ. Congress has no legislative duty whatsoever to conduct foreign policy, especially attempting to derail ongoing negotiations. They get to ratify treaties and declare wars. The Constitution is very clear on this. So is the Logan Act
Any citizen of the United States, wherever he may be, who, without authority of the United States, directly or indirectly commences or carries on any correspondence or intercourse with any foreign government or any officer or agent thereof, with intent to influence the measures or conduct of any foreign government or of any officer or agent thereof, in relation to any disputes or controversies with the United States, or to defeat the measures of the United States, shall be fined under this title or imprisoned not more than three years, or both.
Clearly Congressmen are not exempt. Clearly correspondence was carried on. Clearly intent to influence the conduct of a foreign government was committed. Clearly an attempt to defeat the measure of the United states was commenced.
Neither the Logan Act nor the Constitution prohibit Congressmen from visiting a foreign country and foreign leaders. It happens all the time. Nor are Congressmen prohibited from annoying the President.
Jesse Jackson got a US pilot released. Did he try to defeat the measures of the United States? Nope.
And must I point out that what Reagan "was doing" in Nicaragua was illegal and 11 administration officials were indicted and convicted. Kerry and another senator traveled to Nicaragua on official business and spoke with people on both sides of the conflict to conduct an investigation into the situation--an investigation that exposed Oliver North and the Iran Contra Scandal for breaking US law, covertly trading 2,512 TOW missiles with the enemy, and illegally transferring government money to a foreign element that had been specifically prohibited by Congress.
Pelosi was accompanied at the Syria meeting by a Republican congressman and Bush State Department officials. She informed the White House and State Department of her trip, and foreign policy experts said that her visit didn't stray from a "typical" congressional visit. Three Republican congressmen also met with Assad prior to her visit.
Tell me, did Pelosi or Kerry correspond with a foreign government with intent to defeat the measures of the United States? Nope. Can you produce those documents? Nope. Were there ongoing negotiations with the governments of those countries that they tried to defeat? Nope.
So, are you defending this Cotton weasel and his letter or just objecting to the Constitution and the Logan Act?