Trump went on to accuse former Secretary of State John Kerry of giving \"VERY BAD advice\" to Iran in a possible \"Big violation of Logan Act,\" which makes it illegal for unauthorized citizens to negotiate with foreign governments in dispute with the U.S.

Kerry is a favorite target of Trump and some of his senior advisers for meeting with Iranian officials since leaving office and apparently telling them to wait Trump out -- activity that critics call unseemly, but is not likely criminal, since no one has been prosecuted under the Logan Act since 1852.

It's unclear what sanctions would look like, whether each country would face them if they did not completely end their import of Iranian oil, and when. Senior State Department officials dismissed those questions as hypothetical at this point, but Pompeo hinted at cutting off access to the U.S. financial market.

\"We've made clear: If you don't abide by this, there'll be sanctions. ... To conduct these transactions, one almost always needs to participate in financial markets,\" he said.

\"PHOTO:
Sait Serkan Gurbuz/AP
PHOTO: Secretary of State Mike Pompeo speaks during a news conference, April 22, 2019, at the Department of State in Washington, D.C.
>

Turkey's Foreign Minister Mevlüt Çavuşoğlu was quick to respond, rejecting \"unilateral sanctions and impositions on how to conduct relations with neighbors,\" Çavuşoğlu said in a tweet.

While the sanctions tighten the economic pressure on Iran's government, Pompeo said the ultimate goal is to get Iran to change its behavior, especially its ballistic missile development, funding of groups like Hamas and Hezbollah, and detention of U.S. citizens.

\"If they're prepared to come to the table and negotiate those things to get to that outcome, fantastic. If not, the campaign with which we've been engaged ... will continue,\" he said.

But while he reportedly told a group of Iranian Americans privately that the Trump administration will not use military force to overthrow the Iranian regime, he would not repeat that language on Monday. Instead, he warned Iran that \"If Americans are attacked, we will respond in a serious way.\"

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