Key topics:US denied envoy visa, escalates diplomatic isolation of SA.Tensions rise over SA's Iran ties, Israel stance.Looming US tariffs threaten massive job losses in SA.Sign up for your early morning brew of the BizNews Insider to keep you up to speed with the content that matters. The newsletter will land in your inbox at 5:30am weekdays. Register here.Support South Africa’s bastion of independent journalism, offering balanced insights on investments, business, and the political economy, by joining BizNews Premium. Register here.If you prefer WhatsApp for updates, sign up to the BizNews channel here.The auditorium doors will open for BNIC#2 on 10 September 2025 in Hermanus. For more information and tickets, click here..By Kerry Lanaghan.Under the Trump administration, US-South Africa relations have hit their lowest point in decades. South Africa is increasingly being treated as a diplomatic outcast by Washington, with the US blacklisting key envoys, boycotting major meetings, and threatening harsh economic penalties. The most symbolic move came when the US denied a diplomatic visa to President Cyril Ramaphosa’s special envoy, Mcebisi Jonas - a respected former deputy finance minister and current chairman of telecom giant MTN - refusing to recognise him as an official interlocutor. Jonas’s absence from key delegations has strengthened claims by South Africa’s Democratic Alliance (DA) that he is unwelcome in Washington.Ramaphosa appointed Jonas to reset relations after years of escalating tensions. The relationship soured after Trump cut US aid to South Africa and accused its government of persecuting white citizens. Additional strain came when South Africa brought a genocide case against Israel at the International Court of Justice, and re-engaged with Iran, long considered a US adversary. Washington has responded by freezing high-level engagement, downgrading its diplomatic presence at global meetings hosted by South Africa, and isolating the country within the G20 - despite Ramaphosa currently chairing the group.Critics say this aligns with a broader strategy to sideline South Africa diplomatically. Foreign policy analyst Priyal Singh notes that the Trump administration appears intent on cutting off crucial lines of communication. Ramaphosa’s attempt to fill the void left by the expelled South African ambassador, Ebrahim Rasool, by appointing Jonas has been undermined not only by Jonas’s past criticism of Trump but also by MTN’s significant investment in Iran, a red flag for the US administration.According to experts, South Africa’s diplomatic stance, shaped by values like racial justice, Palestinian solidarity, and multilateralism, is in direct conflict with Trump’s worldview. His administration views South Africa’s Black Economic Empowerment policy as racially discriminatory and sees Ramaphosa’s G20 agenda, centred on global equity and sustainability, as “woke” ideology. These profound ideological differences make reconciliation unlikely.The looming threat of severe US tariffs on South African exports is compounding the diplomatic crisis. Trump has signalled that he may impose a 30% tariff in August, which could devastate South Africa’s economy. Reserve Bank Governor Lesetja Kganyago has warned that such measures could result in 100,000 job losses, a grave concern in a country with nearly 33% unemployment.As analysts like W. Gyude Moore argue, South Africa is not alone in facing Trump’s ire, but the damage could be lasting. With US support dwindling and ties frayed, South Africa may need to pivot towards new alliances and brace for a protracted diplomatic and economic storm.(This article is a précis of a piece originally published in BBC and can be read in full here.)