Senate Democrats are seeking to amend a U.S. Postal Service reform bill to minimize potentially closing mail offices, while Senate Republicans want to tack on amendments that would curtail collective bargaining rights for union mail service employees and reduce costs.

On Thursday, Senate Majority Leader Harry ReidHarry Mason ReidHarry Reid calls for end to all caucuses Reid pushes back on Sanders suggestion that a Democrat with plurality of delegates should be the nominee Harry Reid on 'Medicare for All': 'Not a chance in hell it would pass' MORE (D-Nev.) announced a compromise over which amendments the chamber would consider attaching to S.1789, the 21st Century Postal Service Act. The agreement, to vote on 39 amendments from both Republicans and Democrats, came after Reid used a procedural move to stop Sen. Rand PaulRandal (Rand) Howard PaulCongress set for clash over surveillance reforms Senate braces for fight over impeachment whistleblower testimony Pelosi names first-ever House whistleblower ombudsman director MORE (R-Ky.) from adding an amendment that would have cut off American aid to Egypt. Reid said the amendment was too broad.

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The 39 amendments that the Senate will vote on Tuesday are all related in some way to Postal Service reform. For the most part, Democrats are submitting amendments that would make it harder to close post offices in order to save the mail service, while Republicans are proposing a range of amendments aimed at cutting mail service costs and curtailing rights for unionized employees.

For example, Sen. Claire McCaskillClaire Conner McCaskillDemocrats criticize Medal of Freedom for Limbaugh as 'slap in the face' Kansas City, Kan., responds to Trump tweet: We root for the Chiefs, too Trump mocked for Super Bowl tweet confusing Missouri for Kansas MORE (D-Mo.) is proposing an amendment that would "prohibit the closing of a rural post office unless certain conditions are met and to establish a moratorium on the closing of rural post offices." Similarly, Senate Majority Whip Dick DurbinRichard (Dick) Joseph DurbinOvernight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development Democratic senators ask DOJ watchdog to expand Giuliani probe MORE (D-Ill.) is offering an amendment that keeps "the Postal Service from closing, consolidating, or reducing the workforce of certain postal facilities." Sen. Charles SchumerCharles (Chuck) Ellis SchumerImmigrants who seek opportunity should comply with longstanding American values The Hill's 12:30 Report: Sanders's momentum puts Democrats on edge Schumer confirms spending K on cheesecake in 10 years: 'Guilty as charged' MORE (D-N.Y.), the top messaging Democrat in the chamber, has an amendment meant to "maintain all current door delivery point services."

Meanwhile, Paul is offering a number of amendments to curtail union bargaining rights for mail service employees. For example, one amendment prohibits employees "from engaging in collective bargaining." Paul is also proposing an amendment that closes "post offices in the Capitol Complex." Another, also sponsored by Paul, makes the mail service "take into consideration the impact of regulations when developing a profitability plan."

Sen. Jim DeMint is also offering an amendment that protects "postal workers with respect to their right not to subsidize union nonrepresentational activities." Sen. Tom CoburnThomas (Tom) Allen CoburnOvernight Energy: Experts criticize changes to EPA lead, copper rule | House panel looks into plan to limit powers of EPA science advisers | Senate bill aims for net-zero carbon emissions by 2050 Trump budget proposal funds financially struggling museum in Reagan's childhood home The Hill's Morning Report — Presented by PhRMA — Worries grow about political violence as midterms approach MORE's (R-Okla.) amendment would let the service "close unprofitable office facilities."

Both Senate Republicans and their Democratic counterparts spent the last week or so debating the postal bill. Both sides argued strongly in support of reforming the service so that it could avoid going broke, but the amendments to which the chamber agreed suggest two different approaches to how the service should be saved.