The caravan attempting to cross into Mexico. Photo: John Moore/Getty Images

A group of nearly 4,000 Honduran immigrants heading toward the United States pushed through a Guatemalan border fence with Mexico before being held up by Mexican authorities on Friday.

The details: Police officers unleashed pepper spray and tear gas just after a group of about 50 migrants advanced into Mexico, causing the rest of the caravan to retreat, the AP reports.

Migrants trying to turn people around before clashing with police. Photo: John Moore/Getty Images
Members of the caravan cheering. Photo: John Moore/Getty Images
Mexican authorities holding riot shields. Photo: John Moore/Getty Images
A woman with a child, both hit with tear gas. Photo: John Moore/Getty Images
An officer ordering a man with a child in his arms to move away from the crowd. Photo: John Moore/Getty Images
A migrant at the gate separating Guatemala and Mexico. Photo: John Moore/Getty Images

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Susan Collins says Senate should postpone Supreme Court vote

Sen. Susan Collins. Photo: Tom Williams/Getty Images

Sen. Susan Collins (R-Maine) said in a statement Saturday she believes whoever is elected in the 2020 presidential race should pick the nominee to fill Justice Ruth Bader Ginsburg's Supreme Court seat.

Why it matters: Collins will be key in how the nomination process plays out. As one of the most centrist Senate Republicans, whether or not the Senate confirms Trump's SCOTUS nominee could hinge on her vote.

Updated 51 mins ago - Politics & Policy

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Illustration: Sarah Grillo/Axios

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Ben Geman, author of Generate
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The new politics of global warming

Photo illustration: Sarah Grillo/Axios. Getty Images photos: Ethan Miller and Chip Somodevilla

The 2020 election is both very different and very familiar when it comes to the politics of global warming and the stakes of the outcome.

What's new: Democratic voters are more concerned than in prior presidential cycles, polling shows.