Good morning, I’m Tim Walker with today’s essential stories.

Tehran taking ‘reciprocal measures’ after Trump pullout

A year after Donald Trump pulled the US out of the Iran nuclear deal, Tehran has announced it will take the “reciprocal measure” of partially withdrawing from the agreement it signed with the US and other world powers in 2015. Iran’s intentions were formally conveyed to ambassadors from those countries that remained inside the deal: Russia, China, the UK, France and Germany.

Maximum pressure. The US has pursued a policy of “maximum pressure” on Tehran: threatening fines against multinationals who do business with Iran, declaring the country’s Revolutionary Guards a terrorist group and sending an aircraft carrier group to the Gulf.

Iran-Iraq tensions. On Tuesday the US secretary of state, Mike Pompeo, cancelled a long-planned meeting with Angela Merkel in Berlin to instead fly to Iraq to show US support for the Iraqi government amid the rising tensions with Iran.

White House orders McGahn to resist congressional subpoena

Facebook Twitter Pinterest McGahn listens to Trump at a cabinet meeting in June 2018. Photograph: Jonathan Ernst/Reuters

The Trump administration’s war with Democrats continued to rage on Tuesday, as the White House told Congress it had ordered its former counsel Don McGahn to resist a House judiciary committee subpoena for documents relating to the Russia investigation. The committee demanded documents from McGahn on 36 matters, including Michael Flynn’s resignation and the now-infamous Trump Tower meeting of June 2016. A White House lawyer claimed in a letter that McGahn “does not have the legal right to disclose these documents to third persons”.

Trump’s taxes. Trump’s businesses lost a total of more than $1bn between 1985 and 1994, enabling him to avoid paying income taxes for eight of those 10 years, according to IRS transcripts obtained by the New York Times.

US a hotbed of climate science denial, international poll finds

Facebook Twitter Pinterest Protesters block roads during a recent Extinction Rebellion demonstration in New York. Photograph: Go Nakamura/ZUMA Wire/REX/Shutterstock

Americans are unusually prone to climate science skepticism compared with people in other countries, a new international poll has found. A total of 13% of Americans polled in the 23-country survey agreed with the statement that the climate is changing “but human activity is not responsible at all”, while another 5% believed the climate was not in fact changing. Only in Saudi Arabia and Indonesia did more people deny the existence of human-caused climate change.

Democrat plans. Other members of their party may be behind the Green New Deal, but of the two dozen Democrats running for president, only Jay Inslee and Beto O’Rourke have so far presented climate plans to make the US carbon neutral.

Uber drivers strike over wages as investors await IPO bonanza

Facebook Twitter Pinterest Dais Jalal sleeps in a San Francisco parking lot to avoid a lengthy commute from Sacramento. Photograph: Brian L Frank/The Guardian

Uber drivers in eight US cities are planning a 12-hour strike on Wednesday, to protest about their low wages before the company’s public offering on 10 May, which is expected to make several existing billionaires more wealthy. In San Francisco, some Uber drivers are forced to sleep in their cars to turn a profit. They are demanding the firm provide them a living wage, transparency in decision-making, employee benefits and a voice in company decisions.

Billionaires’ club. Among those set to get even richer when Uber goes public on Friday are the company’s founder, Travis Kalanick, and the world’s richest man, the Amazon boss Jeff Bezos, who was an early investor in the ride-sharing app.

Crib sheet

Must-reads

Facebook Twitter Pinterest Sunn O))): ‘like Black Sabbath got stuck in an almost-stationary lava field’. Illustration: Guardian Design Team

50 great tracks to sample in May

FKA Twigs’ best song to date is a response to the haters who targeted her relationship with Robert Pattinson. Stormzy’s Vossi Bop may already be the sound of the summer. They’re both among the Guardian music team’s monthly selection of 50 essential new tracks.

The ‘very, very slim odds’ for Republicans taking on Trump

The 2020 Democratic primaries are already famously crowded. But there are also more than 50 Republicans set to challenge Trump for their party’s presidential nomination. Some have quit their careers or spent their life savings to compete, as Adam Gabbatt reports.

How Augusta Savage blazed a trail for women of colour in art

Augusta Savage was the first African American woman to open her own art gallery in America in 1939. Now, writes Nadja Sayej, a new exhibition in New York examines her influence as an overlooked artist, activist and trailblazer of African American arts.

Eight experts’ solutions for a broken capitalist system

Discontent with America’s economic system is widespread. The Guardian asked eight experts for potential solutions, from tax credits to wage hikes to improved childcare provision. But not all of them agreed capitalism was broken in the first place.

Opinion

Alexandria Ocasio-Cortez’s boyfriend, Riley Roberts, was compared by one online wag to a “bin raccoon” after he appeared in the new Netflix documentary Knock Down the House. If only more ambitious women had “bin raccoon” boyfriends who encouraged their success without being threatened by their intelligence, says Arwa Mahdawi.

Far too many women are held back from their ambitions by male partners who don’t do their fair share.

Sport

Liverpool staged one of the all-time great Champions League comebacks at Anfield on Tuesday night, laying waste to Lionel Messi’s Barcelona in the second leg of their semi-final with an extraordinary 4-0 win that coach Jürgen Klopp credited to the “mentality of giants”.

The Carolina Hurricanes haven’t seen an NHL post-season since 2009. But this year they upset the defending Stanley Cup champions on their way to the conference final – and had a conspicuous amount of fun doing it, writes Colin Horgan

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