VP Pence didn't tell them to end the investigation. He knows decisions regarding this debacle are not under his purview. That is why he said "I would very respectfully encourage the special counsel and his team to bring their work to conclusion".
Respectfully encouraging Mueller to work to a conclusion is absolutely not the same thing as "Telling Russia special counsel Robert Mueller to wrap up his investigation".
Lindsey Graham is a lying, self-aggrandizing, backstabbing, conniving little toad.
I became convinced of that for well over a decade and I am suspicious even when he looks like he is doing something we might like.
When he put up that Obamacare repeal bill I was sure he had a deal with his buddy McCain to kill it,.
Probably Homo too.