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The bill combines an extension of tax cuts passed in 2017 with other tax measures and spending cuts.Trump and his congressional allies are trying to satisfy both budget hawks who want deeper spending cuts and Republicans who want tax reductions but worry about the effects of cutting some programmes.

That has led to one of the biggest questions: How much spending to slash?The numbers can be daunting, especially for a party that has traditionally pushed to reduce the country's debt.The nonpartisan Congressional Budget Office estimates that the bill would, over the next decade, add about $2.3 trillion (£1.7tn) to the national debt, which is currently around $36.2tn (£27tn).

Cutting government health care programmes and tax incentives for green energy would save money, but the CBO and most economists believe that still wouldn't be enough to make up for revenue lost by the bill's tax cuts.The prospect of swelling national debt - which Trump promised to tackle during his election campaign - has prompted opposition from the House Freedom Caucus.

Perhaps the most contentious item in the bill are cuts - partly through work requirements - to Medicaid, a healthcare programme aimed at lower-income Americans.

Chip Roy of Texas and other Republicans in the House - including South Carolina's Ralph Norman, Oklahoma's Josh Brecheen and Georgia's Andrew Clyde - are pressing for the bill to go further.All photographs subject to copyright.

We asked our readers to send in their best pictures on the theme of "monochrome". Here is a selection of the photographs we received from around the world.The next theme is "my best photo" and the deadline for entries is 18 March.

The pictures will be published later that week and you will be able to find them, along with other galleries, on thesection of the BBC News website.