Here is the fact-check of the claim:

Analysis:

• According to BBC News and Reuters, President Donald Trump posted on social media on Saturday, June 13, 2026, stating that a deal with Iran was "scheduled to get signed on Sunday"¹².
• However, Iranian officials cast doubt on that timing. Iranian Foreign Ministry spokesperson Esmaeil Baghaei said on Saturday that the signing would not be "tomorrow" and that comments about the exact date should be cautious due to "hesitation of the other side"¹.
• By Sunday, June 14, 2026, Trump himself shifted his message, stating that the deal was "already signed" and that details would be released "pretty soon"³⁴.
• Multiple sources indicate the formal signing ceremony is scheduled for Friday, June 19, 2026, in Geneva/Switzerland, not the Sunday Trump initially mentioned⁵⁶.
• The claim database confirms Trump announced the deal was "complete" but notes the official ceremony is set for June 19⁶.

Conclusion:

Trump did publicly state that a deal would be signed on Sunday, but the timeline was disputed by Iran and subsequently shifted. The formal signing ceremony is scheduled for June 19, 2026 (Friday), and by Sunday itself Trump was already claiming the deal was signed. The claim captures an initial statement Trump made but omits the important context that the timing was contested and the formal signing was later set for a different day.

Overall validity: 60%

1. Trump says deal to end war will be signed on Sunday, Iran ... - Reuters
2. Trump says Iran deal is scheduled to be signed on Sunday | BBC News
3. Iran and US agree deal to end war as Israel says its forces will ... - BBC
4. Trump says the US and Iran have signed a deal to end the war
5. Trump's Iran Deal: What We Know, What's Contested, and What ...
6. President Donald Trump stated that a peace deal with Iran is officially complete.