U.S. Senator Marco Rubio's absence from important diplomatic talks with Iran indicates that he is focusing more on staying inside as a national security advisor rather than his role in foreign policy. It is noted that President Donald Trump has delegated diplomatic duties to other individuals, while Rubio is said to be concentrating more on internal security issues during this process. This situation points to changes in the roles of key figures in the U.S. Iran policy and diplomatic processes. However, more information is needed about the reasons behind and the effects of these changes concerning Rubio.