The US state department has announced that it plans to move forward with mass layoffs as part of the most significant restructuring of the country’s diplomatic corps in decades. Officials say the cuts will align their mission with Donald Trump’s vision of America first.

The layoffs, which are commonly called reductions in force (or RIFs), along with voluntary redundancies, will affect nearly 15% of the state department’s domestic staff. A senior state department official said that was close to 1,800 people. The restructuring will also see several hundred bureaus merged or eliminated entirely. The department advises the president and leads the US in foreign policy issues.

The state department went forward with the layoffs, which were long expected, after the supreme court sided this week with the Trump administration against a federal judge’s hold on plans for mass government firings that could affect hundreds of thousands of federal employees.