Republican Representative Marjorie Taylor Greene of Georgia, a staunch ally of President Donald Trump, issued a scathing, 660-word critique of his recent foreign policy decisions on social media Friday, warning that the president is at risk of "losing the base."Newsweek reached out to Greene's press office, the White House, the Pentagon and the State Department for comment via email on Friday.Why It Matters Greene, one of Trump's most loyal backers and a leading voice in the "Make America Great Again" (MAGA) movement, expressed sharp frustration with the administration as Trump surpassed the 100-day mark of his second term.Although Greene warned that Trump is "losing the base," recent polls show he continues to enjoy strong support among Republican voters and lawmakers.An Associated Press-NORC poll of 1,260 adults in April found that about 70 percent of Republicans believe Trump is at least a "good" president. The poll had a margin or error of plus or minus 3.9 percentage points.Meanwhile, the Republican-led Congress and Trump's Cabinet are forging ahead on key agenda items, including a GOP-led budget resolution, immigration and border security.What To Know Much of Greene's criticism in her lengthy X (formerly Twitter) post centered on foreign policy issues.The Georgia representative started her post by writing, "I represent the base and when I'm frustrated and upset over the direction of things, you better be clear, the base is not happy."Iran "I campaigned for no more foreign wars. And now we are supposedly on the verge of going to war with Iran," she wrote.A fourth round of nuclear negotiations between the United States and Iran, originally scheduled for Saturday, has been postponed amid rising tensions and the threat of military action from Trump.The postponement follows fresh U.S. sanctions on Iranian oil networks and warnings from Washington about Tehran's alleged support for Yemen's Houthi forces. Iran has criticized the U.S. for what it describes as contradictory and provocative behavior.The Houthis have been attacking ships in the Red Sea in solidarity with Gaza amid Israel's ongoing military actions against Hamas. Since mid-March, the U.S. has launched over 1,000 airstrikes on Houthi targets in Yemen. Iran says the group acts independently and has denounced the strikes as destabilizing."I don't think we should be bombing foreign countries on behalf of other foreign countries especially when they have their own nuclear weapons and massive military strength," Greene wrote, likely referencing the belief that Israel possesses a nuclear weapon.UkraineThe Republican lawmaker then turned to Ukraine and the recent minerals deal Washington struck with Kyiv after months of tense negotiations.Greene repeated a slew of falsehoods about the Russia-Ukraine war and Ukrainian President Volodymyr Zelensky that Trump and far-right Republicans have pushed, writing on X: "We have signed a deal for mineral rights in Ukraine, in order to pay us back for the hundreds of billions of dollars that we gave Ukraine and they used for money laundering, sold the weapons we gave them to our enemies, and their leader is a dictator who canceled elections, was involved of the first impeachment of Trump, and campaigned for Biden."Trump told NewsNation the minerals agreement with Ukraine ensures that that the U.S. gets "much more" than the $350 billion he argues the U.S. has provided Kyiv, though most estimates put the actual figure as closer to $130 billion.Greene on Friday compared the minerals deal to the Iraq War, writing: "Didn't we learn our lesson when we went to war in Iraq and killed Saddam Hussein because of 'weapons of mass destruction?'"The lawmaker went on to argue for a more "America First" approach, writing: "Why don't we just mine our own rare earth minerals that are tied up on federal lands that the government confiscated years ago?"She also voiced frustration over other policy issues, including the COVID-19 vaccine, which she has frequently railed against, the "rogue judicial system" and the lack of congressional rescissions, among other things.What People Are Saying U.S. President Donald Trump wrote in a Truth Social post on Thursday: " ALERT: All purchases of Iranian Oil, or Petrochemical products, must stop, NOW! Any Country or person who buys ANY AMOUNT of OIL or PETROCHEMICALS from Iran will be subject to, immediately, Secondary Sanctions. They will not be allowed to do business with the United States of America in any way, shape, or form. Thank you for your attention to this matter"Secretary of Defense Pete Hegseth wrote in an X post on Wednesday: "Message to IRAN: We see your LETHAL support to The Houthis. We know exactly what you are doing. You know very well what the U.S. Military is capable of — and you were warned. You will pay the CONSEQUENCE at the time and place of our choosing."Scott Bessent, US Treasury secretary said in a statement the Ukraine minerals deal "signals clearly to Russia that the Trump Administration is committed to a peace process centered on a free, sovereign, and prosperous Ukraine over the long term".What Happens NextBoth the U.S. and Ukraine expressed optimism about the recently-struck minerals deal. While it does not include any security guarantees from the U.S., those in Kyiv have been cautiously optimistic that Washington will help ward off further Russian aggression out of its own self-interest if it's invested in Ukraine. Negotiations for a lasting peace deal remain ongoing.Meanwhile, Iranian officials have said the next round of nuclear talks would be rescheduled "depending on the U.S. approach." Omani officials, who have been mediating the discussions, said the most recent postponement was for logistical reasons.